EP2998567A1 - Kraftstoffeinspritzdüsenplatte - Google Patents

Kraftstoffeinspritzdüsenplatte Download PDF

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Publication number
EP2998567A1
EP2998567A1 EP14798280.5A EP14798280A EP2998567A1 EP 2998567 A1 EP2998567 A1 EP 2998567A1 EP 14798280 A EP14798280 A EP 14798280A EP 2998567 A1 EP2998567 A1 EP 2998567A1
Authority
EP
European Patent Office
Prior art keywords
fuel
nozzle
nozzle plate
modification
orifice
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14798280.5A
Other languages
English (en)
French (fr)
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EP2998567B1 (de
EP2998567A4 (de
Inventor
Koji Noguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Enplas Corp
Original Assignee
Enplas Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Enplas Corp filed Critical Enplas Corp
Publication of EP2998567A1 publication Critical patent/EP2998567A1/de
Publication of EP2998567A4 publication Critical patent/EP2998567A4/de
Application granted granted Critical
Publication of EP2998567B1 publication Critical patent/EP2998567B1/de
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Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1853—Orifice plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1826—Discharge orifices having different sizes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/184—Discharge orifices having non circular sections

Definitions

  • This invention relates to a nozzle plate for a fuel injection device which is mounted on a fuel injection port of a fuel injection device, and injects fuel flowed out from the fuel injection port in an atomized manner.
  • An internal combustion engine (hereinafter, abbreviated as "engine") of an automobile or the like is configured such that combustible air-fuel mixture is formed by mixing fuel injected from a fuel injection device and air introduced into the engine through a suction pipe, and the combustible air-fuel mixture is burnt in a cylinder. It has been known that, in such an engine, a mixture state of fuel injected from the fuel injection device and air largely influences performance of the engine. Particularly, it has been known that atomization of fuel injected from the fuel injection device is an important factor which influences performance of the engine.
  • Fig. 54 illustrates views showing a nozzle plate 1002 mounted in a fuel injection port 1001 of a fuel injection device 1000.
  • the nozzle plate 1002 is formed such that a nozzle hole 1003 having a quadrangular shape as viewed in a plan view gradually increases a size thereof toward the other end side from one end side in the plate thickness direction, and is mounted in the fuel injection port 1001 of the fuel injection device 1000 such that one end side of the nozzle plate 1002 in the plate thickness direction is positioned on a fuel injection port 1001 side of the fuel injection device 1000.
  • An interference body 1005 is formed on a nozzle hole opening edge 1004 on the other end side of the nozzle plate 1002 in the plate thickness direction, and the interference body 1005 is configured to partially close the nozzle hole 1003.
  • an inlet-side nozzle hole portion 1003a positioned on a fuel injection port 1001 side of the fuel injection device 1000 and an outlet-side nozzle hole portion 1003b positioned downstream of the inlet-side nozzle hole portion 1003a along the fuel injection direction are formed by etching, and respective corner portions 1007 of the outlet-side nozzle hole portion 1003b are rounded.
  • fuel injected from the nozzle hole 1003 formed in the nozzle plate 1002 minimally forms a sharpened liquid film and hence, atomization generated by friction of fuel with air becomes insufficient.
  • a nozzle plate for a fuel injection device which can inject fuel flowed out from a fuel injection port of a fuel injection device in a sufficiently atomized manner.
  • the present invention is directed to, as shown in Fig. 1 to Fig. 52 , a nozzle plate 3 for a fuel injection device mounted on a fuel injection port 4 of a fuel injection device 1 and provided with a nozzle hole 7 through which fuel injected from the fuel injection port 4 passes.
  • a nozzle plate 3 for a fuel injection device an outlet-side opening portion 15 of the nozzle hole 7 which is an opening of a fuel flow-out side is partially closed by interference bodies 16, 16', 16", 16a, 51, 65, 76 so that an orifice 8 which throttles the flow of fuel is formed by the outlet-side opening portion 15 and the interference bodies 16, 16', 16", 16a, 51, 65, 76.
  • the interference bodies 16, 16', 16", 16a, 51, 65, 76 has an outer edge portion (21, 33, 33', 34, 54, 66, 77, 86) which forms a part of an opening edge of the orifice 8, a portion of fuel which passes through the nozzle hole 7 is atomized by making the portion of fuel which passes through the nozzle hole 7 impinge on the interference body 16, 16', 16", 16a, 51, 65, 76, and the flow of fuel is formed into a turbulent flow such that atomization of fuel which passes through the orifice 8 in air is facilitated by sharply bending the flow of a portion of fuel which passes through the nozzle hole 7 thus making the flow of the portion of fuel impinge on fuel which intends to straightly advance and pass through the nozzle hole 7 and the orifice 8.
  • a corner portion 22, 22' of the opening edge of the orifice 8 formed by the outlet-side opening portion 15 of the nozzle hole 7 and the interference body 16, 16', 16", 16a, 51, 65, 76 is formed into a non-rounded sharpened shape thus forming an end portion of a liquid film of fuel which passes through the orifice 8 into a sharpened shape which is easily atomized by a friction between the end portion of the liquid film of fuel and air.
  • a portion of fuel injected from the fuel injection port of the fuel injection device is atomized by impinging on the interference body and, at the same time, the flow of the portion of fuel is sharply bent and impinges on fuel which straightly advances and passes through the nozzle hole and the orifice thus turning the flow of fuel which straightly advances and passes through the nozzle hole and the orifice into a turbulent flow.
  • both end portions of the orifice form non-rounded sharpened corner portions and hence, a liquid film of fuel injected from the corner portion of the orifice is formed into a thin sharpened and pointed state and hence, fuel injected from the corner portions of the orifice is easily atomized due to a friction between the liquid film and air. Accordingly, the nozzle plate according to the present invention can further improve the level of atomization of fuel compared to conventional nozzle plates.
  • Fig. 1 is a view schematically showing a use state of a fuel injection device 1 on which a nozzle plate for a fuel injection device according to this embodiment is mounted.
  • the fuel injection device 1 of a port injection method is mounted on a middle portion of an intake pipe 2 of an engine, fuel is injected into the intake pipe 2, and air and fuel introduced into the intake pipe 2 are mixed thus forming combustible air-fuel mixture.
  • Fig. 2 illustrates views showing a distal end side of the fuel injection device 1 on which a nozzle plate 3 for a fuel injection device (hereinafter referred to as "nozzle plate”) is mounted.
  • Fig. 2A is a longitudinal cross-sectional view of the distal end side of the fuel injection device 1 (the cross-sectional view taken along a line B1-B1 in Fig. 2B).
  • Fig. 2B is a bottom plan view of the distal end side of the fuel injection device 1 (the view showing a distal end surface of the fuel injection device 1 as viewed from the direction A1 in Fig. 2A ).
  • Fig. 3A is an enlarged view of a portion C in Fig. 2B (the plan view of a portion of the nozzle plate 3).
  • Fig. 3B is a cross-sectional view of the nozzle plate 3 taken along a line B2-B2 in Fig. 3A ).
  • the nozzle plate 3 is mounted on a distal end side of a valve body 5 in which a fuel injection port 4 is formed.
  • the fuel injection device 1 is configured such that a needle valve 6 is opened or closed by a solenoid not shown in the drawing.
  • a needle valve 6 is opened, fuel in the valve body 5 is injected from the fuel injection port 4, and fuel injected from the fuel injection port 4 passes through nozzle holes 7 and orifices 8 formed in the nozzle plate 3, and is injected to the outside.
  • the nozzle plate 3 is a bottomed cylindrical body made of a synthetic resin material (for example, PPS, PEEK, POM, PA, PES, PEI, LCP) and is formed of a cylindrical wall portion 10 and a bottom wall portion 11 integrally formed on one end side of the cylindrical wall portion 10.
  • the nozzle plate 3 is fixed to the valve body 5 in a state where the cylindrical wall portion 10 is fitted on an outer periphery of a distal end side of a valve body 5 with no gap formed therebetween, and an inner surface 12 of the bottom wall portion 11 is brought into contact with a distal end surface 13 of the valve body 5.
  • a plurality of (a pair of) nozzle holes 7 which make the fuel injection port 4 formed in the valve body 5 communicate with the outside are formed in the bottom wall portion 11 of the nozzle plate 3.
  • the nozzle hole 7 formed in the nozzle plate 3 is a straight circular hole which is orthogonal to the inner surface 12 of the bottom wall portion 11.
  • the nozzle hole 7 is formed so as to introduce fuel injected from the fuel injection port 4 formed in the valve body 5 from an inlet-side opening portion 14 which faces the fuel injection port 4, and to inject fuel introduced from the inlet-side opening portion 14 from an outlet-side opening portion 15 side (an opening portion side from which fuel flows out) which faces the outside.
  • the outlet-side opening portion 15 of the nozzle hole 7 is formed into a circular shape.
  • the nozzle hole 7 is formed in a thin wall portion 11 a of the bottom wall portion 11 which is formed by counterboring.
  • the interference body 16 has a frustoconical shape, wherein an outer diameter size of the interference body 16 is gradually decreased as the interference body 16 extends in the +Z axis direction shown in Fig. 3B from the outlet-side opening portion 15 of the nozzle hole 7, and a side surface 17 of the interference body 16 is formed into a tapered shape.
  • the side surface 17 of the interference body 16 intersects with a fuel impinging surface 18 on which a portion of fuel passing through the nozzle hole 7 impinges at an acute angle.
  • the fuel impinging surface 18 of the interference body 16 is formed so as to be positioned coplanar with an outer surface 20 of the bottom wall portion 11 (a surface positioned on a side opposite to the inner surface 12).
  • the interference body 16 closes a portion of the outlet-side opening portion 15 of the nozzle hole 7 thus forming the orifice 8 which suddenly throttles fuel flowing in the nozzle hole 7 on the outlet-side opening portion 15 of the nozzle hole 7.
  • An opening edge of the orifice 8 is formed into a crescent shape by the circular outlet-side opening portion 15 of the nozzle hole 7 and a portion (circular outer edge portion) of a circular outer edge portion (outer edge portion) 21 of the interference body 16 thus forming non-rounded sharpened and pointed corner portions 22 on both end portions of the orifice 8.
  • a hole diameter of the nozzle hole 7 (a diameter of the outlet-side opening portion 15) d1, a diameter d2 of the circular outer edge portion 21 of the interference body 16, a ratio between the diameters (d1:d2), a maximum gap size ⁇ 1 of the orifice 8 (the maximum gap size ⁇ 1 of the orifice 8 on an extension 23 of a line which connects the center o1 of the nozzle hole 7 and the center o2 of the interference body 16), an inclination angle ⁇ of the side surface 17 of the interference body 16 (an angle ⁇ made by the side surface 17 of the interference body 16 and a direction along the +Z axis), an angle ⁇ made by the extension 23 of the line which connects the center o2 (o2')of the interference body 16 and the center o1 of the nozzle hole 7 and an X axis (X axis positioned on a line which connects the centers o1 of the pair of nozzle holes 7,7),
  • Fig. 4 is a view showing the structure of an injection molding die 24 used for forming the nozzle plate 3 by injection molding.
  • a cavity 27 is formed between a first die 25 and a second die 26, and nozzle hole forming pins 28, 28 for forming the nozzle holes 7,7 project into the inside of the cavity 27.
  • Distal ends of the nozzle hole forming pins 28, 28 are made to abut against a cavity inner surface 30 of the first die 25.
  • Recessed portions 31, 31 for forming the interference bodies 16, 16 are formed in the vicinity of portions of the first die 25 against which the nozzle hole forming pins 28, 28 are made to abut.
  • the nozzle plate 3 which includes the interference bodies 16, 16 as integral parts thereof is formed ( Fig. 2 and Fig. 3 ).
  • the fuel impinging surface 18 of the interference body 16 and the outer surface 20 of the bottom wall portion 11 are formed to be positioned on the same plane, and both end portions of the orifice 8 having a crescent shape are formed into the non-rounded sharpened corner portions 22, 22.
  • the nozzle plate 3 formed by such injection molding exhibits high production efficiency compared to nozzle plates formed by etching or electric discharge machines and hence, a product unit price can be reduced.
  • a portion of fuel injected from the fuel injection port 4 of the fuel injection device 1 is atomized by impinging on the fuel impinging surface 18 of the interference body 16 and, at the same time, the flow of the portion of fuel is sharply bent by the fuel impinging surface 18 and impinges on fuel which advances and passes through the nozzle holes 7 and the orifices 8 thus turning the fuel which advances and passes through the nozzle holes 7 and the orifices 8 into a turbulent flow.
  • both end portions of the orifice 8 form non-rounded sharpened corner portions 22, 22.
  • a liquid film of fuel injected from both corner portions 22, 22 of the orifice 8 and areas in the vicinity of the corner portions 22, 22 is formed into a thin, sharpened and pointed state and hence, fuel injected from the corner portions 22, 22 of the orifice 8 and areas in the vicinity of the corner portions 22, 22 is easily atomized due to a friction between the liquid film and air in the vicinity of the orifice 8.
  • the opening edge of the orifice 8 exhibits a crescent shape where the opening edge converges toward both corner portions 22, 22 from a center portion so that the opening edge of the orifice 8 is narrowed toward the corner portions 22, 22. Accordingly, fuel discharged from the orifice 8 is formed into a thin film shape (a curtain shape) having the maximum thickness ⁇ 1 in conformity with a shape of the opening edge of the orifice 8 whereby the atomization can be acquired more effectively.
  • the nozzle plate 3 according to this embodiment can further improve the level of atomization of fuel injected from the orifice 8 compared to conventional nozzle plates.
  • the side surface 17 of the interference body 16 is formed so as to intersect with the fuel impinging surface 18 of the interference body 16 at an acute angle, and an air layer is formed between fuel which passes through the orifice 8 and the side surface 17 of the interference body 16 and hence, fuel which passes through the orifice 8 is easily entrapped into air whereby the atomization of fuel which passes through the orifice 8 is accelerated thus facilitating the uniform dispersion of atomized fuel in the intake pipe 2 (see Fig. 1 ).
  • both end portions of the orifice 8 are formed into non-rounded sharpened corner portions 22, 22, an orifice width at a center portion of the opening edge of the orifice 8 is large, and the opening edge of the orifice 8 is narrowed in a converging manner toward both corner portions 22, 22 from the center portion. Accordingly, compared to the case where the orifice 8 is formed with a uniform width, it is possible to impart directivity to fuel to be injected from the orifice 8 such that density of fuel injected from the orifice 8 becomes maximum in a particular direction.
  • an injection angle of fuel can be easily changed by suitably changing any one or a plurality of parameters selected from a group of parameters consisting of a hole diameter of the nozzle hole 7 (a diameter of the outlet-side opening portion 15) d1, a diameter d2 of the circular outer edge portion 21 of the interference body 16, a ratio between the diameters (d1:d2), a maximum gap ⁇ 1 of the orifice 8 (the maximum gap ⁇ 1 of the orifice 8 along an extension 23 of a line which connects the center o1 of the nozzle hole 7 and the center o2 of the interference body 16), an inclination angle ⁇ of the side surface 17 of the interference body 16 (an angle ⁇ made by the side surface 17 of the interference body 16 and a direction along the +Z axis), an angle ⁇ made by the extension of the line which connects the center o2 (o2') of the interference body 16 and the center o1 of the nozzle hole 7 and an X axis (X
  • Fig. 5 illustrates views showing an essential part of a nozzle plate 3 according to a first modification of the first embodiment (corresponding to Fig. 3 ).
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the first embodiment are given same symbols, and the explanations which overlap with the explanations of the nozzle plate 3 according to the first embodiment are omitted.
  • the nozzle plate 3 according to this modification differs from the nozzle plate 3 of the first embodiment with respect to a point that a nozzle hole 7 is formed of a triangular hole, and an outlet-side opening portion 15 of the nozzle hole 7 has a triangular shape.
  • corner portions 22, 22 of an opening edge of an orifice 8 formed by the outlet-side opening portion 15 of the nozzle hole 7 and a circular outer edge portion 21 of an interference body 16 are formed into a non-rounded sharpened shape and hence, an end portion of a liquid film of fuel which passes through the orifice 8 can be formed into a sharpened and pointed shape by which an end portion of a liquid film of fuel can be easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the nozzle plate 3 according to this modification can, in the same manner as the nozzle plate 3 according to the above-mentioned first embodiment, further improve the level of atomization of fuel compared to conventional nozzle plates.
  • Fig. 6 illustrates views showing an essential part of a nozzle plate 3 according to a second modification of the first embodiment (corresponding to Fig. 3 ).
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the first embodiment are given same symbols, and the explanations which overlap with the explanations of the nozzle plate 3 according to the first embodiment are omitted.
  • the nozzle plate 3 according to this modification differs from the nozzle plate 3 according to the first embodiment with respect to a point that a nozzle hole 7 which is a circular hole is formed obliquely with respect to a fuel impinging surface 18, and an outlet-side opening portion 15 of a nozzle hole 7 is formed into an elliptical shape.
  • corner portions 22, 22 of an opening edge of an orifice 8 formed by the outlet-side opening portion 15 of the nozzle hole 7 and a circular outer edge portion 21 of an interference body 16 are formed into a non-rounded sharpened shape and hence, an end portion of a liquid film of fuel which passes through the orifice 8 can be formed into a sharpened and pointed shape by which the end portion of the liquid film of fuel can be easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the nozzle plate 3 according to this modification can, in the same manner as the nozzle plate 3 according to the above-mentioned first embodiment, further improve the level of atomization of fuel compared to conventional nozzle plates.
  • the nozzle hole 7 is disposed obliquely to the fuel impinging surface 18 and hence, an injection direction of fuel is determined corresponding to an angle made by a direction orthogonal to the fuel impinging surface 18 (a direction along a +Z axis) and a center line 32 of the nozzle hole 7 (an inclination angle of the nozzle hole 7) ⁇ whereby fuel can be accurately injected in a target direction.
  • Fig. 7 illustrates views showing an essential part of a nozzle plate 3 according to a third modification of the first embodiment (corresponding to Fig. 3 ).
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the first embodiment are given same symbols, and the explanations which overlap with the explanations of the nozzle plate 3 according to the first embodiment are omitted.
  • a shape of an interference body 16' differs from the shape of the interference body 16 of the nozzle plate 3 according to the first embodiment. That is, in this modification, a shape of the interference body 16' of the nozzle plate 3 as viewed in a plan view (the shape of the interference body 16' as viewed from a direction A2 in Fig. 7 ) is formed into a shape where both end portions of a rectangular shape in a longitudinal direction are formed into a semicircular shape.
  • the interference body 16' is formed such that the longitudinal direction of the interference body 16' follows an extension 23 (X-axis direction) of a line which connects the centers of a pair of nozzle holes 7, 7, and an orifice 8 is formed by a semicircular outer edge portion (circular outer edge portion, outer edge portion) 33 on one end side of the interference body 16' and a circular outlet-side opening portion 15 of the nozzle hole 7.
  • Corner portions 22, 22 of an opening edge of the orifice 8 formed by the outlet-side opening portion 15 of the nozzle hole 7 and the semicircular outer edge portion 33 of the interference body 16' are formed into a non-rounded sharpened shape and hence, an end portion of a liquid film of fuel which passes through the orifice 8 can be formed into a sharpened and pointed shape by which the end portion of the liquid film of fuel can be easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the interference body 16' is, in the same manner as the inference body 16 having a frustoconical shape in the above-mentioned embodiment, formed such that a side surface 17' intersects with a fuel impinging surface 18 at an acute angle.
  • the nozzle plate 3 according to this modification can, in the same manner as the nozzle plate 3 according to the above-mentioned first embodiment, further improve the level of atomization of fuel compared to conventional nozzle plates.
  • Fig. 8 illustrates views showing an essential part of a nozzle plate 3 according to a fourth modification of the first embodiment (corresponding to Fig. 3 ).
  • the nozzle plate 3 according to the fourth modification is a nozzle plate obtained by partially changing the nozzle plate 3 according to the third modification.
  • constitutional portions substantially equal to the constitutional portions of the nozzle plates 3 according to the first embodiment and the third modification are given same symbols, and the explanations which overlap with the explanations of the nozzle plates 3 according to the first embodiment and the third modification are omitted.
  • the nozzle plate according to this modification includes an interference body 16' substantially equal to the interference body 16' of the nozzle plate 3 according to the above-mentioned third modification.
  • an amount that the interference body 16' closes a nozzle hole 7 is larger than an amount that interference body 16' closes the nozzle hole 7 in the above-mentioned third modification, and an orifice 8 is formed by a semicircular outer edge portion 33 on one end side of the interference body 16', straight outer edge portions (outer edge portions) 34, 34 which are connected to the semicircular outer edge portion 33, and a circular outlet-side opening portion 15 of the nozzle hole 7.
  • Corner portions 22, 22 of an opening edge of the orifice 8 formed by the outlet-side opening portion 15 of the nozzle hole 7 and the straight outer edge portions 34, 34 of the interference body 16' are formed into a non-rounded sharpened shape and hence, an end portion of a liquid film of fuel which passes through the corner portions 22 of the orifice 8 and areas in the vicinity of the corner portions 22 can be formed into a sharpened and pointed shape by which the end portion of the liquid film of fuel can be easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the corner portions 22, 22 of the opening edge of the orifice 8 are pointed in a narrower manner than the corresponding corner portions 22, 22 in the nozzle plate 3 of the third modification and hence, and an end portion of a liquid film of fuel which passes through the orifice 8 can be further easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the nozzle plate 3 according to this modification can, in the same manner as the nozzle plate 3 according to the above-mentioned first embodiment, further improve the level of atomization of fuel compared to conventional nozzle plates.
  • Fig. 9 illustrates views showing an essential part of a nozzle plate 3 according to a fifth modification of the first embodiment (corresponding to Fig. 3 ).
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the first embodiment are given same symbols, and the explanations which overlap with the explanations of the nozzle plate 3 according to the first embodiment are omitted.
  • a pair of interference bodies 16 having a frustoconical shape is formed on the nozzle plate 3, and the number of corner portions 22, 22, 22, 22 of an opening edge of an orifice 8 formed by a circular outlet-side opening portion 15 of a nozzle hole 7 and circular outer edge portions 21, 21 of the interference bodies 16, 16 is increased twice compared to the number of corner portions of the nozzle plate 3 according to the above-mentioned embodiment (see Fig. 3 ).
  • the respective corner portions (corner portions in four places) 22 of the opening edge of the orifice 8 formed by the circular outlet-side opening portion 15 of the nozzle hole 7 and the circular outer edge portions 21, 21 of the interference bodies 16, 16 are formed into a non-rounded sharpened and pointed shape.
  • a liquid film which passes through the corner portions 22 of the orifice 8 and the areas in the vicinity of the corner portions 22 can be made thin whereby an end portion of the liquid film of fuel which passes through the orifices 8 can be easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the centers of the pair of interference bodies 16, 16 and the center of the nozzle hole 7 are positioned on a line B7-B7 (on a line along an X-axis direction). Distances between the center of the nozzle hole 7 to the respective circular outer edge portions 21, 21 are set to ( ⁇ 2/2).
  • the nozzle plate 3 according to this modification can acquire a larger effect of atomizing fuel by the corner portions 22 having a non-rounded sharpened and pointed shape than the nozzle plate 3 according to the above-mentioned first embodiment and hence, the nozzle plate 3 according to this modification can inject fuel in a wider range than the nozzle plate 3 according to the above-mentioned first embodiment.
  • the directivity and an injection angle of fuel injected to the outside from the orifice 8 can be changed by changing a distance (gap) ⁇ 2 between the pair of interference bodies 16, 16.
  • Fig. 10 illustrates views showing an essential part of a nozzle plate 3 according to a sixth modification of the first embodiment (corresponding to Fig. 3 ).
  • Fig. 10 also illustrates views showing a modification of the nozzle plate 3 according to the fifth modification.
  • constitutional portions substantially equal to the constitutional portions of the nozzle plates 3 according to the first embodiment and the fifth modification are given same symbols, and the explanations which overlap with the explanations of the nozzle plates 3 according to the first embodiment and the fifth modification are omitted.
  • a pair of interference bodies 16, 16 are made to abut against each other and hence, in addition to corner portions 22, 22, 22, 22 formed on four portions of an opening edge of an orifice 8 formed by a circular outlet-side opening portion 15 of a nozzle hole 7 and circular outer edge portions 21, 21 of the interference bodies 16, 16, 16, two corner portions 22', 22' are formed on a portion where the pair of interference bodies 16, 16 abut against each other.
  • the respective corner portions 22 formed on the opening edge of the orifice 8 formed by the circular outlet-side opening portion 15 of the nozzle hole 7 and the circular outer edge portions 21, 21 of the interference bodies 16, 16 and the corner portions 22', 22' which are formed on the portion where the pair of interference bodies 16, 16 abut against each other are formed into a non-rounded sharpened and pointed shape. Accordingly, a liquid film which passes through the respective corner portions 22, 22' of the orifice 8 and the areas in the vicinity of the corner portions 22, 22' can be made thin and hence, an end portion of the liquid film of fuel which passes through the orifices 8 can be easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the centers of the pair of interference bodies 16, 16 and the center of the nozzle hole 7 are positioned on a line B8-B8 (on a line along an X-axis direction).
  • a contact point of the pair of circular outer edge portions 21, 21 agrees with the center of the nozzle hole 7.
  • the nozzle plate 3 according to this modification can acquire a larger effect of atomizing fuel by the corner portions 22, 22'having a non-rounded sharpened and pointed shape than the nozzle plates 3 according to the above-mentioned first embodiment and the above-mentioned fifth modification.
  • Fig. 11 illustrates views showing an essential part of a nozzle plate 3 according to a seventh modification of the first embodiment (corresponding to Fig. 3 ).
  • Fig. 11 also illustrates views showing a modification of the nozzle plate 3 according to the fifth modification.
  • constitutional portions substantially equal to the constitutional portions of the nozzle plates 3 according to the first embodiment and the fifth modification are given same symbols, and the explanations which overlap with the explanations of the nozzle plates 3 according to the first embodiment and the fifth modification are omitted.
  • the nozzle plate 3 according to this modification differs from the nozzle plate 3 according to the fifth modification with respect to a point that a nozzle hole 7 is formed of a quadrangular hole, and an outlet-side opening portion 15 of a nozzle hole 7 has a quadrangular shape.
  • respective corner portions 22 of an opening edge of an orifice 8 formed by an outlet-side opening portion 15 of the nozzle hole 7 and circular outer edge portions 21, 21 of interference bodies 16, 16 are formed into a non-rounded sharpened shape and hence, an end portion of a liquid film of fuel which passes through the orifices 8 can be formed into a sharpened and pointed shape by which the end portion of the liquid film of fuel is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the nozzle plate 3 according to this modification can, in the same manner as the nozzle plate 3 according to the above-mentioned fifth modification, acquire a larger effect of atomizing fuel by the respective corner portions 22 having a non-rounded sharpened and pointed shape than the nozzle plates 3 according to the above-mentioned first embodiment, and can inject fuel in a wider range than the nozzle plates 3 according to the above-mentioned first embodiment.
  • Fig. 12 illustrates views showing an essential part of a nozzle plate 3 according to an eighth modification of the first embodiment (corresponding to Fig. 3 ).
  • Fig. 12 also illustrates views showing a modification of the nozzle plate 3 according to the sixth modification.
  • constitutional portions substantially equal to the constitutional portions of the nozzle plates 3 according to the first embodiment and the sixth modification are given same symbols, and the explanations which overlap with the explanations of the nozzle plates 3 according to the first embodiment and the sixth modification are omitted.
  • the nozzle plate 3 according to this modification differs from the nozzle plate 3 according to the sixth modification with respect to a point that a contact position P1 of a pair of interference bodies 16, 16 is positioned at an intersecting point between a center line (a center line along a Y-axis direction) 35 of nozzle holes 7 and an outlet-side opening portion 15 of the nozzle hole 7, and the contact position between the pair of interference bodies 16, 16 is positioned at the center of the nozzle hole 7.
  • one corner portion 22' is formed on a portion where the pair of interference bodies 16, 16 abut against each other.
  • the respective corner portions 22 formed on the opening edge of the orifice 8 formed by the circular outlet-side opening portion 15 of the nozzle hole 7 and the circular outer edge portions 21, 21 of the pair of interference bodies 16, 16 and the corner portion 22' on the portion where the pair of interference bodies 16, 16 abut against each other are formed into a non-rounded sharpened and pointed shape.
  • an end portion of the liquid film which passes through the orifices 8 can be formed into a thin film and hence, the end portion of the liquid film of fuel which passes through the orifice 8 can be easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the nozzle plate 3 according to this modification can acquire a larger effect of atomizing fuel by the respective corner portions 22, 22' having a non-rounded sharpened and pointed shape than the nozzle plate 3 according to the above-mentioned first embodiment.
  • Fig. 13 illustrates views showing an essential part of a nozzle plate 3 according to a ninth modification of the first embodiment (corresponding to Fig. 3 ).
  • Fig. 13 also illustrates views showing a modification of the nozzle plate 3 according to the fourth modification.
  • constitutional portions substantially equal to the constitutional portions of the nozzle plates 3 according to the first embodiment and the fourth modification are given same symbols, and the explanations which overlap with the explanations of the nozzle plates 3 according to the first embodiment and the fourth modification are omitted.
  • three interference bodies 16' substantially equal to the interference bodies 16' of the nozzle plate 3 according to the above-mentioned fourth modification are formed in a close contact state with each other, and the interference bodies 16' are arranged such that a center line 36 of the interference body 16' positioned at the center in a longitudinal direction agrees with a center line (a center line extending along an X axis) 37 of a nozzle hole 7.
  • an orifice 8 is formed by semicircular outer edge portions 33 of three interference bodies 16' on one end side and a circular outlet-side opening portion 15 of the nozzle hole 7. Corner portions 22 of an opening edge of the orifice 8 formed by the outlet-side opening portion 15 of the nozzle hole 7 and the semicircular outer edge portions 33 of three interference bodies 16' are formed into a non-rounded sharpened shape and hence, an end portion of a liquid film of fuel which passes through the orifice 8 is formed into a sharpened and pointed shape by which the end portion of the liquid film of fuel can be easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • corner portions 22' formed in a contact portion between the semicircular outer edge portions 33, 33 of the interference bodies 16', 16' arranged adjacent to each other are formed into a non-rounded sharpened shape and hence, an end portion of a liquid film of fuel which passes through the orifice 8 is formed into a sharpened and pointed shape by which the end portion of the liquid film of fuel can be easily atomized due to a friction between the end portion of the liquid film of fuel and air. That is, in this modification, the corner portions 22, 22' having a non-rounded sharpened shape are formed on four portions of the nozzle plate 3.
  • the nozzle plate 3 according to this modification can acquire a larger effect of atomizing fuel by the corner portions 22, 22' having a non-rounded sharpened and pointed shape than the nozzle plates 3 according to the above-mentioned first embodiment.
  • Fig. 14 illustrates views showing an essential part of a nozzle plate 3 according to a tenth modification of the first embodiment (corresponding to Fig. 3 ).
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the first embodiment are given same symbols, and the explanations which overlap with the explanations of the nozzle plate 3 according to the first embodiment are omitted.
  • a fuel impinging surface 18 of an interference body 16 is spaced apart from an outer surface 20 of a bottom wall portion 11 by h in a +Z axis direction, and a circular outer edge portion 21 of the interference body 16 and an outlet-side opening portion 15 of a nozzle hole 7 are separated in the +Z axis direction by a gap 38.
  • an orifice 8 having a crescent shape is formed by a circular outer edge portion 21 of the interference body 16 and a circular outlet-side opening portion 15 of the nozzle hole 7, and non-rounded sharpened and pointed corner portions 22, 22 are formed on both end portions of the orifice 8 having a crescent shape respectively.
  • a nozzle plate 3 according to this modification when fuel is injected from the orifice 8, air is entrapped into sprayed fuel from the gap 38 formed between the fuel impinging surface 18 of the interference body 16 and an outer surface 20 of the bottom wall portion 11. Accordingly, a larger amount of air flows into fuel than the case where fuel is injected using the nozzle plate 3 according to the first embodiment and hence, the nozzle plate 3 according to this modification has an effect of atomizing fuel.
  • the formation of the gap 38 between the fuel impinging surface 18 of the interference body 16 and the outer surface 20 of the bottom wall portion 11 is applicable to the above-mentioned first to ninth modifications.
  • Fig. 15 illustrates views showing an essential part of a nozzle plate 3 according to an eleventh modification of the first embodiment and views showing an example similar to the fifth modification (see Fig. 9 ).
  • constitutional portions substantially equal to the constitutional portions of the nozzle plates 3 according to the first embodiment and the fifth modification are given same symbols, and the explanations which overlap with the explanations of the nozzle plates 3 according to the first embodiment and the fifth modification are omitted.
  • the pair of interference bodies 16, 16 in the fifth modification is shifted in a +X direction with respect to the center CL of the nozzle hole 7 by ⁇ 3.
  • respective corner portions (corner portions in four places) 22 of an opening edge of an orifice 8 formed by a circular outlet-side opening portion 15 of the nozzle hole 7 and a pair of circular outer edge portions 21, 21 of the interference bodies 16, 16 are formed into a non-rounded sharpened and pointed shape.
  • a liquid film of fuel which passes through the corner portions 22 of the orifice 8 and the areas in the vicinity of the corner portions 22 can be made thin and hence, an end portion of the liquid film of fuel which passes through the orifice 8 can be easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • an area which one of the pair of interference bodies 16, 16 closes the nozzle hole 7 differs from an area which the other of the pair of interference bodies 16, 16 closes the nozzle hole 7. That is, the area which one interference body 16 (-X direction side in Fig. 15 ) closes the nozzle hole 7 is larger than the area which the other interference body 16 (+X direction side in Fig.
  • the example is described where the pair of interference bodies 16, 16 is shifted in the +X direction with respect to the center CL of the nozzle hole 7.
  • this modification is not limited to such a case, and which direction that the pair of interference bodies 16, 16 is to be shifted with respect to the center CL of the nozzle hole 7 is determined based on which direction of fuel is to be injected with respect to the center CL of the orifice 8.
  • Fig. 16 illustrates views showing an essential part of a nozzle plate 3 according to a twelfth modification of the first embodiment and views showing an example similar to the sixth modification (see Fig. 10 ).
  • constitutional portions substantially equal to the constitutional portions of the nozzle plates 3 according to the first embodiment and the sixth modification are given same symbols, and the explanations which overlap with the explanations of the nozzle plates 3 according to the first embodiment and the sixth modification are omitted.
  • the pair of interference bodies 16, 16 in the sixth modification is shifted in a +X direction with respect to the center CL of the nozzle hole 7 by ⁇ 3.
  • the nozzle plate 3 of this modification in addition to respective corner portions (corner portions in four places) 22 of an opening edge of an orifice 8 formed by a circular outlet-side opening portion 15 of the nozzle hole 7 and circular outer edge portions 21, 21 of a pair of interference bodies 16, 16, corner portions 22', 22' are formed in two places where the pair of interference bodies 16, 16 abut against each other.
  • corner portions 22, 22' are formed into a non-rounded sharpened and pointed shape.
  • a liquid film which passes through the corner portions 22, 22' of the orifice 8 and the areas in the vicinity of the corner portions 22, 22' can be made thin and hence, an end portion of the liquid film which passes through the orifice 8 can be easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • an area which one of the pair of interference bodies 16, 16 closes the nozzle hole 7 differs from an area which the other of the pair of interference bodies 16, 16 closes the nozzle hole 7. That is, the area which one interference body 16 (-X direction side in Fig. 15 ) closes the nozzle hole 7 is larger than the area which the other interference body 16 (+X direction side in Fig.
  • the example is described where the pair of interference bodies 16, 16 is shifted in the +X direction with respect to the center CL of the nozzle hole 7.
  • this modification is not limited to such a case, and which direction that the pair of interference bodies 16, 16 is to be shifted with respect to the center CL of the nozzle hole 7 is determined based on which direction fuel is to be injected with respect to the center CL of the orifice 8.
  • Fig. 17 illustrates views showing an essential part of a nozzle plate 3 according to a thirteenth modification of the first embodiment and views showing an example similar to the twelfth modification (see Fig. 16 ).
  • constitutional portions substantially equal to the constitutional portions of the nozzle plates 3 according to the first embodiment and the twelfth modification are given same symbols, and the explanations which overlap with the explanations of the nozzle plates 3 according to the first embodiment and the twelfth modification are omitted.
  • one of a pair of interference bodies 16, 16 (interference body 16 on a right side: +X side) is formed smaller than the other of the pair of interference bodies 16, 16 (interference body 16 on a left side: -X side).
  • the nozzle plate 3 according to this modification can acquire a fuel injection characteristic different from that of the nozzle plate 3 according to the twelfth modification.
  • the nozzle plate 3 according to this modification in the same manner as the nozzle plate 3 according to the twelfth modification, in addition to respective corner portions (corner portions in four places) 22 of an opening edge of the orifice 8 formed by a circular outlet-side opening portion 15 of the nozzle hole 7 and circular outer edge portions 21, 21 of the pair of the interference bodies 16, 16, corner portions 22', 22' are formed in two places where a pair of interference bodies 16, 16 abuts against each other.
  • Fig. 18 illustrates views showing an essential part of a nozzle plate 3 according to a fourteenth modification of the first embodiment and views showing an example similar to the thirteenth modification (see Fig. 17 ).
  • constitutional portions substantially equal to the constitutional portions of the nozzle plates 3 according to the first embodiment and the thirteenth modification are given same symbols, and the explanations which overlap with the explanations of the nozzle plates 3 according to the first embodiment and the thirteenth modification are omitted.
  • one of the pair of interference bodies 16, 16 of the nozzle plate 3 according to the thirteenth modification is replaced with the interference body 16' shown in Fig. 8 , and the other interference body 16 (interference body 16 on a left side: -X side) is made to abut against one interference body 16' in a state where the interference bodies 16, 16' are collapsed by pressing (having a contact of a predetermined width in ⁇ Y direction).
  • an opening area of the orifice 8 becomes narrow, and an area that one interference body 16' closes the nozzle hole 7 and an area that the other interference body 16 closes the nozzle hole 7 become different from each other.
  • a sharpened corner portion 22 formed by the circular outlet-side opening portion 15 of the nozzle hole 7 and a straight outer edge portion 34 of the interference body 16' have a shape which is narrower and more sharpened than the corner portions 22 of the nozzle plate 3 according to the thirteenth modification.
  • the corner portions 22', 22' formed at an abutting portion 42 where one interference body 16' and the other interference body 16 of this modification abut against each other are less sharpened than the corner portions 22', 22' of the nozzle plate 3 according to the thirteenth modification.
  • the nozzle plate 3 according to this modification can acquire a fuel injection characteristic which differs from a fuel injection characteristic of the nozzle plate 3 according to the thirteenth modification.
  • the abutting portion 42 between the interference body 16 and the interference body 16' is shifted from the center CL of the nozzle hole 7 in the +X direction by ⁇ 3.
  • Fig. 19 illustrates views showing an essential part of a nozzle plate 3 according to a fifteenth modification of the first embodiment and views showing an example similar to the fourteenth modification (see Fig. 18 ).
  • constitutional portions substantially equal to the constitutional portions of the nozzle plates 3 according to the first embodiment and the fourteenth modification are given same symbols, and the explanations which overlap with the explanations of the nozzle plates 3 according to the first embodiment and the fourteenth modification are omitted.
  • the nozzle plate 3 according to this modification differs from the nozzle plate 3 according to the fourteenth modification with respect to a point that the nozzle hole 7 formed in the nozzle plate 3 according to the fourteenth modification is formed of a quadrangular hole, and an outlet-side opening portion 15 of the nozzle hole 7 has a quadrangular shape.
  • an abutting portion 42 where one interference body 16' and the other interference body 16 abut against each other is positioned in a shifted manner in a +X direction by ⁇ 3 with respect to the center CL of the nozzle hole 7.
  • two corner portions 22 formed by the outlet-side opening portion 15 of the nozzle hole 7 and a straight outer edge portion 34 of the interference body 16', two corner portions 22 formed by the outlet-side opening portion 15 of the nozzle hole 7 and a circular outer edge portion 21 of the interference body 16, and two corner portions 22' formed on the abutting portion 42 where the interference body 16' and the interference body 16 abut against each other are formed into a non-rounded sharpened shape and hence, an end portion of a liquid film of fuel which passes through the orifice 8 can be formed into a sharpened and pointed shape by which the end portion of the liquid film of fuel is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • Fig. 20 illustrates views showing an essential part of a nozzle plate 3 according to a sixteenth modification of the first embodiment and views showing an example similar to the eighth modification (see Fig. 12 ).
  • constitutional portions substantially equal to the constitutional portions of the nozzle plates 3 according to the first embodiment and the eighth modification are given same symbols, and the explanations which overlap with the explanations of the nozzle plates 3 according to the first embodiment and the eighth modification are omitted.
  • a pair of interference bodies 16, 16 is larger than a nozzle hole 7, an abutting portion 42 where the pair of interference bodies 16, 16 abut against each other is positioned on a center line (center line along a Y axis direction) 35 of the nozzle hole 7, one end (a corner portion 22') of the abutting portion 42 where the pair of interference bodies 16, 16 abut against each other is positioned in the vicinity of the center CL of the nozzle hole 7, and the other end of the abutting portion 42 where the pair of interference bodies 16, 16 abut against each other is positioned outside the nozzle hole 7.
  • the nozzle hole 7 is partially closed by the pair of interference bodies 16, 16 so that an orifice 8 having an approximately sector shape is formed by an outlet-side opening portion 15 of the nozzle hole 7 and circular outer edge portions 21, 21 of the pair of interference bodies 16, 16.
  • corner portions 22, 22 formed by the outlet-side opening portion 15 of the nozzle hole 7 and circular outer edge portions 21, 21 of the pair of interference bodies 16, 16 and a corner portion 22' formed on the abutting portion 42 where the pair of interference bodies 16, 16 abut against each other are formed.
  • corner portions 22, 22' of the orifice 8 are formed into a non-rounded pointed shape and hence, an end portion of a liquid film which passes through the orifice 8 can be formed into a thin film and hence, an end portion of a liquid film of fuel which passes through the orifice 8 can be formed into a thin film whereby the end portion of the liquid film of fuel which passes through the orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the nozzle plate 3 according to this modification differs from the nozzle plate 3 according to the eighth modification with respect to a point that an opening area of the orifice 8 is small, and the orifice 8 is offset to a +Y direction side with respect to the center CL of the nozzle hole 7.
  • the nozzle plate 3 according to this modification can exhibit a fuel injection characteristic different from a fuel injection characteristic of the nozzle plate 3 according to the eighth modification.
  • Fig. 21 illustrates views showing an essential part of a nozzle plate 3 according to a seventeenth modification of the first embodiment and views showing an example similar to the ninth modification (see Fig. 13 ).
  • constitutional portions substantially equal to the constitutional portions of the nozzle plates 3 according to the first embodiment and the ninth modification are given same symbols, and the explanations which overlap with the explanations of the nozzle plates 3 according to the first embodiment and the ninth modification are omitted.
  • the nozzle plate 3 according to this modification is such that, in the nozzle plate 3 according to the ninth modification, the interference body 16' positioned at the center portion is shifted to a -X axis direction, and the interference body 16' positioned adjacent to the interference body 16' positioned at the center portion in a +Y axis direction and the interference body 16' positioned adjacent to the interference body 16' positioned at the center portion in a -Y axis direction are changed to interference bodies 16, 16 having a frustoconical shape respectively.
  • the nozzle plate 3 according to this modification can, compared to the nozzle plate 3 according to the ninth modification, narrow a distance between an orifice 8 and the interference bodies 16, 16 close to an X axis and hence, a larger amount of fuel can be ejected through an area close to a +X axis.
  • the pair of interference bodies 16, 16 have a line-symmetry shape with respect to the X axis, and the center position is disposed at a position shifted toward a -X axis direction from a Y axis by a predetermined size ⁇ 4.
  • corner portions 22, 22 formed by circular outer edge portions 21, 21 of a pair of interference bodies 16, 16 and an outlet-side opening portion 15 of a nozzle hole 7 and corner portions 22', 22' formed on the abutting portions 42, 42 where the pair of interference bodies 16, 16 and the interference body 16' abut against each other are formed into a non-rounded sharpened shape. That is, the corner portions 22, 22' can be formed into a sharpened and pointed shape by which an end portion of a liquid film of fuel which passes through the orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • Fig. 22 illustrates views showing an essential part of a nozzle plate 3 according to an eighteenth modification of the first embodiment.
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the first embodiment are given same symbols, and the explanations which overlap with the explanations of the nozzle plate 3 according to the first embodiment are omitted.
  • a nozzle hole 7 is a hole having a rectangular shape, and an outlet-side opening portion 15 of the nozzle hole 7 is formed into a rectangular shape.
  • a first interference body 16 is formed on one longitudinal end side of the rectangular outlet-side opening portion 15, and a second interference body 16 is formed on a corner portion 15c on the other longitudinal end side of the rectangular outlet-side opening portion 15.
  • the first interference body 16 projects toward a nozzle hole 7 side so as to cover both corner portions 15a, 15b of the outlet-side opening portion 15 on one longitudinal end side thus partially closing the outlet-side opening portion 15.
  • the second interference body 16 is formed larger than the first interference body 16, and covers one (15c) of both corner portions 15c, 15d positioned on the other longitudinal end side of the outlet-side opening portion 15, projects toward a nozzle hole 7 side so as to straddle over a long side and a short side which form one corner portion 15c, and partially closes the outlet-side opening portion 15. Further, in this modification, an area where the second interference body 16 partially closes the outlet-side opening portion 15 is larger than an area where the first interference body 16 partially closes the outlet-side opening portion 15.
  • An opening edge of an orifice 8 is formed by arcuate outer edge portions 21, 21 of the first and second interference bodies 16, 16 and the outlet-side opening portion 15 of the nozzle hole 7.
  • corner portions 22 are formed by circular outer edge portions 21, 21 of the first and second interference bodies 16, 16 and the outlet-side opening portion 15 of the nozzle hole 7.
  • corner portions 22 are formed into a non-rounded sharpened shape so that the corner portions 22 can be formed into a sharpened and pointed shape by which an end portion of a liquid film of fuel which passes through the orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • an opening portion 15' narrower than other portions of the outlet-side opening portion 15 is formed between the arcuate outer edge portion 21 of the second interference body 16 and the opening edge of the outlet-side opening portion 15. This narrow opening portion 15' can partially form the flow of fuel which passes through the nozzle hole 7 into a thin film.
  • a portion of fuel which passes through the nozzle hole 7 impinges on a fuel impinging surface 18 of the first interference body 16.
  • the flow direction of fuel which impinges on the fuel impinging surface 18 is sharply changed in a +X direction.
  • a portion of fuel which passes through the nozzle hole 7 impinges on a fuel impinging surface 18 of the second interference body 16, and the flow direction of fuel which impinges on the fuel impinging surface 18 is sharply changed to the substantially -Y direction (see Fig. 22A ).
  • the nozzle plate 3 according to this modification can, compared to the conventional nozzle plates, further enhance the level of atomization of fuel injected from the orifice 8.
  • Fig. 22C is a plan view showing a center portion side of the nozzle plate 3 for a fuel injection device according to this modification.
  • the nozzle hole 7 and the first and second interference bodies 16, 16 are arranged in four places at equal intervals around the nozzle plate center 3c.
  • fuel injected from the respective nozzle holes 7 (orifices 8) generates a spiral flow about the nozzle plate center 3c.
  • FIG. 22C shows merely one example of the case where a plurality of sets each of which is formed of the nozzle hole 7 and the first and second interference bodies 16, 16 are arranged around the nozzle plate center 3c, and this modification is not limited by the configuration shown in Fig. 22C . That is, in this modification, the optimum number of sets each of which is formed of the nozzle hole 7 and the first and second interference bodies 16, 16 which correspond to the use condition or the like may be arranged around the nozzle plate center 3c.
  • Fig. 23 illustrates views showing an essential part of a nozzle plate 3 according to a nineteenth modification of the first embodiment.
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the first embodiment are given same symbols, and the explanations which overlap with the explanations of the nozzle plate 3 according to the first embodiment are omitted.
  • the nozzle plate 3 according to this modification three interference bodies 16, 16, 16 are arranged at equal intervals from each other around the circular outlet-side opening portion 15 of the nozzle hole 7, and a gap 43 is formed between the interference bodies 16, 16 arranged adjacent to each other. Further, in the nozzle plate 3 according to this modification, the orifice 8 is formed by the outlet-side opening portion 15 of the nozzle hole 7 and three interference bodies 16, 16, 16.
  • corner portions 22 are formed by the circular outer edge portions 21 of three interference bodies 16 and the outlet-side opening portion 15 of the nozzle hole 7, and these six corner portions 22 are formed into a non-rounded sharpened shape so that the corner portions 22 are formed into a sharpened and pointed shape by which an end portion of a liquid film of fuel which passes through the orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • nozzle plate 3 In the nozzle plate 3 according to this modification, areas which three interference bodies 16 close the nozzle hole 7 respectively are equal, and a flow passage area of the orifice 8 is gradually decreased in the direction toward an opening edge (outlet-side opening portion 15) of the nozzle hole 7 from the center CL of the nozzle hole 7. Accordingly, the flow of fuel can be easily collected toward the center of the nozzle hole 7, and fuel can be injected in the direction along the center line direction (+Z axis direction) of the nozzle hole 7.
  • the gap 43 formed between the interference bodies 16, 16 arranged adjacent to each other is narrowed in the vicinity of the corner portions 22, 22 and hence, the flow of fuel which passes through areas in the vicinity of the corner portions 22, 22 of the orifice 8 can be formed into a thin film whereby the flow of fuel which passes through the areas in the vicinity of the corner portions 22, 22 of the orifice 8 can be easily atomized due to a friction between the flow of fuel and air.
  • Fig. 24 illustrates views showing an essential part of a nozzle plate 3 according to a twentieth modification of the first embodiment and views showing an example similar to the nineteenth modification (see Fig. 23 ).
  • constitutional portions substantially equal to the constitutional portions of the nozzle plates 3 according to the first embodiment and the nineteenth modification are given same symbols, and the explanations which overlap with the explanations of the nozzle plates 3 according to the first embodiment and the nineteenth modification are omitted.
  • the nozzle plate 3 according to this modification is substantially equal to the nozzle plate 3 according to the nineteenth modification with respect to the point that three interference bodies 16 are arranged at equal intervals from each other around the nozzle hole 7.
  • the nozzle plate 3 according to this modification differs from the nozzle plate 3 according to the nineteenth modification with respect to the following points.
  • the interference body 16 positioned in a +Y direction with respect to the center CL of a nozzle hole 7 is formed smaller than two other interference bodies 16, 16, an area that the small interference body 16 closes the nozzle hole 7 is smaller than areas which other interference bodies 16, 16 close the nozzle hole 7, and the position of centroid of the orifice 8 in Fig. 24A is shifted in the +Y direction from the center CL of the nozzle hole 7.
  • the fuel injection direction from the orifice 8 can be shifted in the +Y direction with respect to the center CL of the nozzle hole 7.
  • the corner portions 22 are formed in six places by circular outer edge portions 21 of three interference bodies 16 and outlet-side opening portions 15 of the nozzle hole 7. These six corner portions 22 are formed into a non-rounded sharpened shape so that the corner portions 22 are formed into a sharpened and pointed shape by which an end portion of a liquid film of fuel which passes through an orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the mode is exemplified where, out of three interference bodies 16 formed in the nozzle plate 3 according to the nineteenth modification, the interference body 16 positioned in the +Y direction is formed smaller than other interference bodies 16, 16.
  • this modification is not limited to such a mode, and any one of three interference bodies 16 may be formed smaller than two other interference bodies 16 depending on the direction along which the injection direction of fuel from the orifice 8 is shifted with respect to the center CL of the nozzle hole 7.
  • two arbitrary interference bodies 16 may be formed smaller than remaining one interference body 16.
  • the nozzle plates 3 made of a synthetic resin material are exemplified.
  • the present invention is not limited to such nozzle plates 3 and is applicable to nozzle plates made of sintered metal which are formed by using a metal injection molding method.
  • the modes where a pair of nozzle holes 7, 7 and a pair of orifices 8 are formed in the nozzle plate 3 are exemplified.
  • the present invention is not limited to such modes, and a single nozzle hole 7 and a single orifice 8 may be formed in a nozzle plate 3, a plurality of (three or more) nozzle holes 7 and a plurality of orifices 8 the number of which is equal to the number of nozzle holes 7 may be formed in a nozzle plate 3, or orifices 8 the number of which is larger than the number of nozzle holes 7 may be formed in a nozzle plate 3.
  • the nozzle plate 3 may be formed by suitably combining the nozzle plates 3 described in the above-mentioned first embodiment and the first to twentieth modifications.
  • Fig. 25 to Fig. 27 illustrate views showing a portion of a nozzle plate 3 according to a second embodiment of the present invention in an enlarged manner.
  • Fig. 25A is a plan view of the nozzle plate 3 (a view corresponding to Fig. 3A )
  • Fig. 25B is a cross-sectional view of the nozzle plate 3 taken along a line B22-B22 in Fig. 25A
  • Fig. 26A is a plan view of a first nozzle plate 3a
  • Fig. 26B is a cross-sectional view of the first nozzle plate 3a taken along a line B23-B23 in Fig. 26A
  • Fig. 27A is a plan view of a second nozzle plate 3b
  • Fig. 27B is a cross-sectional view of the second nozzle plate 3b taken along a line B24-B24 in Fig. 27A .
  • the nozzle plate 3 is formed by overlapping the first nozzle plate 3a and the second nozzle plate 3b which are formed by applying press forming to a metal plate (for example, stainless steel plate).
  • a nozzle hole 7 which is a circular hole is formed in the second nozzle plate 3b.
  • a fuel leaking hole 40 is formed in the first nozzle plate 3a, and an interference body 16" which partially closes a circular outlet-side opening portion 15 of the nozzle hole 7 is formed on the first nozzle plate 3a.
  • the interference body 16" As viewed in a plan view, with respect to a shape of the interference body 16" of the first nozzle plate 3a, the interference body 16" is formed into a tongue-shaped body formed by projecting one side of the fuel leaking hole 40 having an approximately rectangular shape toward the other side which opposedly faces one side, and a distal end side of the interference body 16" is rounded in a semicircular shape. Accordingly, an orifice 8 having a crescent shape is formed between a semicircular outer edge portion (arcuate outer edge portion, outer edge portion) 33' on the distal end side and a circular outlet-side opening portion 22 of the nozzle hole 7.
  • the corner portions 22, 22 of an opening edge of the orifice 8 formed by the outlet-side opening portion 15 of the nozzle hole 7 and the semicircular outer edge portion 33' of the interference body 16" are formed into a non-rounded sharpened shape. That is, the corner portions 22, 22 are formed into a sharpened and pointed shape by which an end portion of a liquid film of fuel which passes through the orifice 8 can be easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • a side surface 41 of the fuel leaking hole 40 excluding the interference body 16" is formed such that the side surface 41 of the fuel leaking hole 40 excluding the interference body 16" is largely separated from the outlet-side opening portion 15 of the nozzle hole 7 so as to prevent the side surface 41 of the fuel leaking hole 40 excluding the interference body 16" from obstructing fuel sprayed from the orifice 8.
  • four corners of the fuel leaking hole 40 are rounded for the sake of convenience of forming the fuel leaking hole 40 using a press.
  • the first nozzle plate 3a and the second nozzle plate 3b are made to overlap with each other in a state where the first nozzle plate 3a and the second nozzle plate 3b are positioned due to concave-convex engagement or the like between positioning projections and positioning holes not shown in the drawing for accurately positioning the interference body 16" with respect to the nozzle hole 7.
  • the nozzle plate 3 according to this embodiment can acquire the substantially equal advantageous effects as the nozzle plate 3 according to the first embodiment.
  • Fig. 28 and Fig. 29 illustrate views showing a nozzle plate 3 according to a third embodiment of the present invention.
  • Fig. 28A is a front view of the nozzle plate 3
  • Fig. 28B is a cross-sectional view of the nozzle plate 3 taken along a line B25-B25 in Fig. 28A
  • Fig. 28C is a back view of the nozzle plate 3.
  • Fig. 29A is an enlarged view of a center portion of the nozzle plate 3 shown in Fig. 28A
  • Fig. 29B is a cross-sectional view of the center portion of the nozzle plate 3 taken along a line B26-B26 in Fig. 29A .
  • the nozzle plate 3 is a bottomed cylindrical body which is an integral body formed of a cylindrical wall portion 10 and a bottom wall portion 11 formed so as to close one end of the cylindrical wall portion 10.
  • the bottom wall portion 11 has a nozzle hole plate portion 50 where a nozzle hole 7 is formed, and an interference body plate portion 52 where an interference body 51 is formed.
  • the interference body plate portion 52 is formed such that a portion of the bottom wall portion 11 around a center axis 53 is counterbored.
  • the nozzle hole plate portion 50 is formed into a shape where a portion of the interference body plate portion 52 around the center axis 53 is partially counterbored in a ring shape.
  • Nozzle holes 7 are formed in the bottom wall portion 11 in six places at equal intervals from each other around the center axis 53, and a portion of the nozzle hole 7 is formed in a penetrating manner in the nozzle hole plate portion 50 from a front side to a back side (such that the nozzle hole 7 opens on the front and back sides).
  • a plurality of interference bodies 51 each of which closes a portion of the nozzle hole 7 are formed on an interference body plate portion 52a (52) on an inner side surrounded by the nozzle hole plate portion 50.
  • the number of the interference bodies 51 is equal to the number of the nozzle holes 7.
  • the interference body 51 corresponds to the interference bodies 16, 16' of the nozzle plate 3 according to the first embodiment, an orifice 8 is formed by partially closing the nozzle hole 7, and the interference body 51 has an arcuate outer edge portion (outer edge portion) 54 which forms a portion of an opening edge of the orifice 8.
  • a corner portion 22 of the opening edge of the orifice 8 formed by the arcuate outer edge portion 54 of the interference body 51 and a circular outlet-side opening portion 15 of the nozzle hole 7 is formed into a non-rounded sharpened shape.
  • the corner portion 22 is formed into a sharpened shape by which an end portion of a liquid film of fuel which passes through the orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • a liquid film of fuel injected from both corner portions 22, 22 of the orifice 8 and areas in the vicinity of the corner portions 22, 22 is formed into a thin, sharpened and pointed state and hence, fuel injected from the corner portions 22, 22 of the orifice 8 and areas in the vicinity of the corner portions 22, 22 is easily atomized due to a friction between the liquid film and air in the vicinity of the orifice 8.
  • the interference body 51 has a fuel impinging surface 55 on which a portion of fuel which passes through the nozzle hole 7 impinges, and a side surface (inclined surface) 56 which intersects with the fuel impinging surface 55 at an acute angle (for example, 75°).
  • the portion of fuel which passes through the nozzle hole 7 is atomized, the flow of the portion of fuel which passes through the nozzle hole 7 is sharply bent, and is made to impinge on fuel which intends to advance straightly and passes through the nozzle hole 7 and the orifice 8 thus forming the flow of fuel into a turbulent flow such that fuel which passes through the orifice 8 is easily atomized in air.
  • an air layer is formed between fuel which passes through the orifice 8 and the side surface 56 of the interference body 51 and hence, fuel which passes through the orifice 8 is easily entrapped into air whereby the atomization of fuel which passes through the orifice 8 is accelerated thus facilitating the uniform dispersion of atomized fuel in the intake pipe 2.
  • the bottom wall portion 11 is formed at a position where a nozzle guard projection 57 surrounds the nozzle hole plate portion 50 and on a radially outer end side of an outer surface 58.
  • the nozzle guard projection 57 is formed so as to project along the direction that a center axis of the valve body 5 extends in a state where the nozzle plate 3 is mounted on a distal end side of the valve body 5 (see Fig. 2 ).
  • the nozzle guard projection 57 is an annular body formed along the circumferential direction of the bottom wall portion 11.
  • the nozzle guard projection 57 is formed so as to form a gap between an imaginary plane and the bottom wall portion 11 when a distal end of the nozzle guard projection 57 is brought into contact with the imaginary plane.
  • the nozzle guard projection 57 formed on the bottom wall portion 11 prevents a tool or the like from impinging on the nozzle hole 7 and the area around the nozzle hole 7 thus preventing the occurrence of a damage on the nozzle hole 7 formed in the bottom wall portion 11 and the area around the nozzle hole 7.
  • the nozzle guard projection 57 prevents engine parts or the like from impinging on the nozzle hole 7 and the area around the nozzle hole 7 thus preventing the occurrence of a damage on the nozzle hole 7 formed in the bottom wall portion 11 and the portions around the nozzle hole 7.
  • a side surface 60 which connects an outer surface of an outer interference body plate portion 52b (52) positioned outside the nozzle hole plate portion 50 and an outer surface of the nozzle hole plate portion 50 to each other is formed into a waveform in conformity with an outer edge of an interference body plate portion 52a (52) positioned on an inner side of the nozzle hole plate portion 50.
  • the side surface 60 is positioned substantially at an equal distance from the outer edge of the interference body plate portion 52a (52).
  • the side surface 60 which connects the outer surface of the nozzle hole plate portion 50 and the outer surface of the outer interference body plate portion 52b (52) to each other, a side surface 61 which connects the outer surface of the interference body plate portion 52b (52) and the outer surface of the bottom wall portion 11, and a side surface 62 of the nozzle guard projection 57 are formed so as not to obstruct spraying of fuel injected from the orifice 8 by taking into account the flow direction (injection direction) of fuel injected from the orifice 8.
  • the nozzle plate 3 according to this embodiment having the above-mentioned configuration can, compared to a case where the interference body 16 is formed on respective nozzle holes 7 separately (see Fig. 2 ), increase a wall thickness of the nozzle plate 3 around the nozzle hole 7 in a wide range and hence, a strength of portions around the nozzle hole 7 can be improved.
  • a liquid film of fuel injected from both corner portions 22, 22 of the orifice 8 and areas in the vicinity of the corner portions 22, 22 is formed into a thin, sharpened and pointed state and hence, fuel injected from the corner portions 22, 22 of the orifice 8 and areas in the vicinity of the corner portions 22, 22 is easily atomized due to a friction between the liquid film and air in the vicinity of the orifice 8.
  • the mode is exemplified where the nozzle holes 7 are formed in six places at equal intervals around the center axis 53 of the bottom wall portion 11.
  • the present invention is not limited to such a mode, and the nozzle holes 7 may be formed in plural (two or more) places at equal intervals or at irregular intervals around the center axis 53 of the bottom wall portion 11.
  • the interference body plate portions 52a, 52b have different planer shapes depending on the number of the nozzle holes 7 and the arrangement of the nozzle holes 7.
  • wall thicknesses of the interference body plate portion 52 and the nozzle hole plate portion 50 of the bottom wall portion 11 are suitably changed corresponding to a required fuel injection characteristic or the like.
  • Fig. 30 and Fig. 31 illustrate views showing a nozzle plate 3 according to a fourth embodiment of the present invention and views showing a modification of the nozzle plate 3 shown in Fig. 24 .
  • Fig. 30A is a front view of the nozzle plate 3
  • Fig. 30B is a cross-sectional view of the nozzle plate 3 taken along a line B27-B27 in Fig. 30A
  • Fig. 30C is a back view of the nozzle plate 3.
  • Fig. 31 A is an enlarged view of a center portion of the nozzle plate 3 shown in Fig. 30A
  • Fig. 31 B is a cross-sectional view of the center portion of the nozzle plate 3 taken along a line B28-B28 in Fig. 31 A .
  • the nozzle plate 3 is a bottomed cylindrical body which is an integral body formed of a cylindrical wall portion 10 and a bottom wall portion 11 formed so as to close one end of the cylindrical wall portion 10.
  • Nozzle holes 7 are formed in the bottom wall portion 11 in three places at equal intervals around a center axis 53.
  • the bottom wall portion 11 is counterbored in an inverse frustoconical shape so as to surround the nozzle holes 7.
  • An interference body plate portion 63 is formed around the nozzle hole 7, and a nozzle hole plate portion 64 is formed by partially counterboring the interference body plate portion 63.
  • the interference body plate portion 63 is formed with a larger wall thickness than the nozzle hole plate portion 64.
  • the area around the nozzle hole 7 is formed into a shape similar to a shape formed by integrally joining three interference bodies 16 shown in Fig. 24A .
  • the interference body plate portions 63 are formed in three places corresponding to the nozzle holes 7 formed in three places.
  • Interference bodies 65 of the interference body plate portions 63 correspond to the interference bodies 16 of the nozzle plate 3 according to the first embodiment, and are formed in three places so as to partially close the nozzle holes 7 in three places.
  • Each one of the interference bodies 65 in three places corresponds to any one of three interference bodies 16 of the nozzle plate 3 shown in Fig. 24A .
  • interference bodies 65 form an orifice 8 by partially closing the nozzle hole 7, and the interference bodies 65 have arcuate outer edge portions (outer edge portions) 66 which form portions of an opening edge of the orifice 8. Corner portions 22 of the opening edge of the orifice 8 formed by the arcuate outer edge portions 66 of the interference bodies 65 and a circular outlet-side opening portion 15 of the nozzle hole 7 are formed into a non-rounded sharpened shape. That is, the corner portions 22 are formed into a sharpened shape by which an end portion of a liquid film of fuel which passes through the orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • a liquid film of fuel injected from both corner portions 22, 22 of the orifice 8 and areas in the vicinity of the corner portions 22, 22 is formed into a thin, sharpened and pointed state and hence, fuel injected from the corner portions 22, 22 of the orifice 8 and areas in the vicinity of the corner portions 22, 22 is easily atomized due to a friction between the liquid film and air in the vicinity of the orifice 8.
  • a portion of the nozzle hole 7 is formed in a penetrating manner in the nozzle hole plate portion 64 having a smaller wall thickness than the interference body plate portion 63 from a front side to a back side (such that the nozzle hole 7 opens on the front and back sides). Further, a side surface 67 of the interference body plate portion 63 which connects the interference bodies 65, 65 arranged adjacent to each other is formed at a position which does not obstruct spraying of fuel by taking into account the injection direction of fuel injected from an outlet-side opening portion 15 of the nozzle hole 7.
  • the interference body 65 has a fuel impinging surface 68 on which a portion of fuel which passes through the nozzle hole 7 impinges, and a side surface (inclined surface) 70 which intersects with the fuel impinging surface 68 at an acute angle (for example, 75°).
  • the portion of fuel which passes through the nozzle hole 7 is atomized, the flow of the portion of fuel which passes through the nozzle hole 7 is sharply bent, and is made to impinge on fuel which intends to advance straightly and passes through the nozzle hole 7 and the orifice 8 thus forming the flow of fuel into a turbulent flow such that fuel which passes through the orifice 8 is easily atomized in air.
  • an air layer is formed between fuel which passes through the orifice 8 and the side surface 70 of the interference body 65 and hence, fuel which passes through the orifice 8 is easily entrapped into air whereby the atomization of fuel which passes through the orifice 8 is accelerated thus facilitating the uniform dispersion of atomized fuel in the intake pipe 2 (see Fig. 1 ).
  • nozzle guard projections 71 are formed at equal intervals in three places along the circumferential direction on a radially outer end side of an outer surface of the bottom wall portion 11.
  • the nozzle guard projections 71 are formed so as to project along the direction that a center axis of the valve body 5 extends in a state where the nozzle plate 3 is mounted on a distal end side of the valve body 5 (see Fig. 2 ).
  • the nozzle guard projection 71 is a block body formed so as to be positioned in a middle portion between the nozzle holes 7, 7 arranged adjacent to each other.
  • the nozzle guard projections 71 are formed so as to form a gap between an imaginary plane and the bottom wall portion 11 when distal ends of the nozzle guard projections 71 are brought into contact with the imaginary plane. In this manner, at the time of assembling the nozzle plate 3 to the valve body 5, the nozzle guard projections 71 formed on the bottom wall portion 11 in three places prevent a tool or the like from impinging on the nozzle hole 7 and the area around the nozzle hole 7 thus preventing the occurrence of a damage on the nozzle hole 7 formed in the bottom wall portion 11 and portions around the nozzle hole 7.
  • the nozzle guard projections 71 prevent engine parts or the like from impinging on the nozzle hole 7 and the area around the nozzle hole 7 thus preventing the occurrence of a damage on the nozzle hole 7 formed in the bottom wall portion 11 and the portions around the nozzle hole 7.
  • a side surface 72 which connects the outer surface of the interference body plate portion 63 and the outer surface of the bottom wall portion 11, and a side surface 73 of the nozzle guard projection 71 are formed so as not to obstruct spraying of fuel injected from the orifice 8 by taking into account the flow direction (injection direction) of fuel injected from the orifice 8.
  • the nozzle plate 3 according to this embodiment having the above-mentioned configuration can, compared to a case where the plurality of interference bodies 16 are formed independently around the nozzle hole 7 (see Fig. 24A ), increase a wall thickness of the nozzle plate 3 around the nozzle hole 7 in a wide range and hence, a strength of portions around the nozzle hole 7 can be improved.
  • a liquid film of fuel injected from the corner portion 22 of the orifice 8 and areas in the vicinity of the corner portion 22 is formed into a thin, sharpened and pointed state and hence, fuel injected from the corner portion 22 of the orifice 8 and areas in the vicinity of the corner portion 22 is easily atomized due to a friction between the liquid film and air in the vicinity of the orifice 8.
  • the mode is exemplified where the nozzle holes 7 are formed in three places at equal intervals around the center axis 53 of the bottom wall portion 11.
  • the present invention is not limited to such a mode, and the nozzle holes 7 may be formed in at least one desired position of the bottom wall portion 11.
  • the interference bodies 65 in this embodiment are formed in three places for one nozzle hole 7, the present invention is not limited to such a case, the optimum number of the nozzle holes 7 and the optimum arrangement of the nozzle holes 7 are determined corresponding to a required fuel injection characteristic or the like.
  • wall thicknesses of the interference body plate portion 63 and the nozzle hole plate portion 64 of the bottom wall portion 11 are suitably changed corresponding to a required fuel injection characteristic or the like.
  • Fig. 32 illustrates views showing a nozzle plate 3 according to a fifth embodiment of the present invention.
  • Fig. 32A is a front view of the nozzle plate 3
  • Fig. 32B is an enlarged view of a center portion of the nozzle plate 3 shown in Fig. 32A
  • Fig. 32C is a partial cross-sectional view of the nozzle plate 3 taken along a line B29-B29 in Fig. 32A .
  • the nozzle plate 3 according to this embodiment differs from the nozzle plate 3 according to the fourth embodiment with respect to a shape of the periphery of a nozzle hole 7 formed in a bottom wall portion 11, other constitutions of the nozzle plate 3 according to this embodiment are substantially equal to the corresponding constitutions of the nozzle plate 3 according to the fourth embodiment. Accordingly, the explanation which overlaps with the explanation of the nozzle plate 3 according to the fourth embodiment is omitted.
  • the nozzle holes 7 are formed in the bottom wall portion 11 in three places at equal intervals around a center axis 53.
  • the bottom wall portion 11 is counterbored in an inverse frustoconical shape so as to surround the nozzle holes 7.
  • An interference body plate portion 74 is formed around the nozzle holes 7, and a nozzle hole plate portion 75 is formed by partially counterboring the interference body plate portion 74.
  • the interference body plate portion 74 is formed with a larger wall thickness than the nozzle hole plate portion 75, and a part of the interference body plate portion 74 partially closes the nozzle hole 7 as an interference body 76.
  • Interference bodies 76 correspond to the interference bodies 16, 16' of the nozzle plate 3 according to the first embodiment, and are formed in three places corresponding to the respective nozzle holes 7.
  • the interference body 76 forms an orifice 8 by partially closing the nozzle hole 7, and the interference body 76 has an arcuate outer edge portion (outer edge portion) 77 which forms a portion of an opening edge of the orifice 8. Corner portions 22 of the opening edge of the orifice 8 formed by the arcuate outer edge portions 77 of the interference body 76 and a circular outlet-side opening portion 15 of the nozzle hole 7 are formed into a non-rounded sharpened shape. That is, the corner portions 22 are formed into a sharpened shape by which an end portion of a liquid film of fuel which passes through the orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • a liquid film of fuel injected from both corner portions 22, 22 of the orifice 8 and areas in the vicinity of the corner portions 22, 22 is formed into a thin, sharpened and pointed state and hence, fuel injected from the corner portions 22, 22 of the orifice 8 and areas in the vicinity of the corner portions 22, 22 is easily atomized due to a friction between the liquid film and air in the vicinity of the orifice 8.
  • a portion of the nozzle hole 7 is formed in a penetrating manner in the nozzle hole plate portion 75 having a smaller wall thickness than the interference body plate portion 74 from a front side to a back side (such that the nozzle hole 7 opens on the front and back sides).
  • the nozzle hole plate portion 75 is formed concentrically with the nozzle hole 7 except for the interference body 76 and areas in the vicinity of the interference body 76. Further, a side surface 78 of the interference body plate portion 74 is formed at a position which does not obstruct spraying of fuel by taking into account the injection direction of fuel injected from an outlet-side opening portion 15 of the nozzle hole 7.
  • the interference body 76 has a fuel impinging surface 80 on which a portion of fuel which passes through the nozzle hole 7 impinges, and a side surface (inclined surface) 81 which intersects with the fuel impinging surface 80 at an acute angle (for example, 75°).
  • the portion of fuel which passes through the nozzle hole 7 is atomized, the flow of the portion of fuel which passes through the nozzle hole 7 is sharply bent, and is made to impinge on fuel which intends to advance straightly and passes through the nozzle hole 7 and the orifice 8 thus forming the flow of fuel into a turbulent flow such that fuel which passes through the orifice 8 is easily atomized in air.
  • an air layer is formed between fuel which passes through the orifice 8 and the side surface 81 of the interference body 76 and hence, fuel which passes through the orifice 8 is easily entrapped into air whereby the atomization of fuel which passes through the orifice 8 is accelerated thus facilitating the uniform dispersion of atomized fuel in the intake pipe 2 (see Fig. 1 ).
  • nozzle guard projections 82 are formed at equal intervals in three places along the circumferential direction on a radially outer end side of an outer surface of the bottom wall portion 11.
  • the nozzle guard projections 82 are formed so as to be positioned in a middle portion between the nozzle holes 7 arranged adjacent to each other.
  • the nozzle guard projections 82 are formed so as to form a gap between an imaginary plane and the bottom wall portion 11 when distal ends of the nozzle guard projections 82 are brought into contact with the imaginary plane. In this manner, at the time of assembling the nozzle plate 3 to a valve body 5 (see Fig.
  • the nozzle guard projections 82 formed on the bottom wall portion 11 in three places prevent a tool or the like from impinging on the nozzle hole 7 and the area around the nozzle hole 7 thus preventing the occurrence of a damage on the nozzle hole 7 formed in the bottom wall portion 11 and portions around the nozzle hole 7.
  • the nozzle guard projections 82 prevent engine parts or the like from impinging on the nozzle hole 7 and the area around the nozzle hole 7 thus preventing the occurrence of a damage on the nozzle hole 7 formed in the bottom wall portion 11 and the portions around the nozzle hole 7.
  • a side surface 83 which connects the outer surface of the interference body plate portion 74 and the outer surface of the bottom wall portion 11, and a side surface 84 of the nozzle guard projection 82 are formed so as not to obstruct spraying of fuel injected from the orifice 8 by taking into account the flow direction (injection direction) of fuel injected from the orifice 8.
  • the nozzle plate 3 according to this embodiment having the above-mentioned configuration can, compared to a case where the interference bodies 16 are independently formed around the nozzle hole 7 (see Fig. 2 ), increase a wall thickness of the nozzle plate 3 around the nozzle hole 7 in a wide range and hence, a strength of portions around the nozzle hole 7 can be improved.
  • a liquid film of fuel injected from both corner portions 22, 22 of the orifice 8 and areas in the vicinity of the corner portions 22, 22 is formed into a thin, sharpened and pointed state and hence, fuel injected from the corner portions 22, 22 of the orifice 8 and areas in the vicinity of the corner portions 22, 22 is easily atomized due to a friction between the liquid film and air in the vicinity of the orifice 8.
  • the mode is exemplified where the nozzle holes 7 are formed in three places at equal intervals around the center axis 53 of the bottom wall portion 11.
  • the present invention is not limited to such a mode, and the nozzle hole 7 may be formed in the bottom wall portion 11 at least at one desired position.
  • Fig. 33 illustrates views showing a nozzle plate 3 according to a sixth embodiment of the present invention.
  • Fig. 33A is a plan view of a portion of the nozzle plate 3
  • Fig. 33B is a partial cross-sectional view of the nozzle plate 3 taken along a line B30-B30 in Fig. 33A .
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the first embodiment are given same symbols, and the explanation which overlaps with the explanation of the nozzle plate 3 according to the first embodiment is omitted.
  • the nozzle plate 3 according to this embodiment is characterized in that a straight outer edge portion 34 of an interference body 16' forms a part of an orifice 8. That is, in the nozzle plate 3 according to this embodiment, an interference body 16 and the interference body 16' partially close a circular outlet-side opening portion 15 of the nozzle hole 7, and the orifice 8 is formed by an arcuate outer edge portion 21 of the interference body 16, the straight outer edge portion 34 of the interference body 16' and the outlet-side opening portion 15 of the nozzle hole 7.
  • the interference body 16 has a circular shape as viewed in a plan view, and the arcuate outer edge portion 21 partially forms the orifice 8.
  • a shape of the interference body 16' as viewed in a plan view is formed into a shape where both end portions of a rectangular shape in a longitudinal direction are formed into a semicircular shape.
  • Corner portions 22 formed by the arcuate outer edge portion 21 of the interference body 16 and the circular outlet-side opening portion 15 of the nozzle hole 7 are formed into a crescent non-rounded sharpened and pointed shape as viewed in a plan view. That is, the corner portions 22 are formed into a sharpened and pointed shape by which an end portion of a liquid film of fuel which passes through the orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • Corner portions 22 formed by the straight outer edge portion 34 of the interference body 16' and the outlet-side opening portion 15 of the nozzle hole 7 are formed into a non-rounded sharpened and pointed shape. That is, the corner portions 22 are formed into a shape by which an end portion of a liquid film of fuel which passes through the orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the interference body 16 and the interference body 16' partially close the outlet-side opening portion 15 of the nozzle hole 7 and hence, a portion of fuel which passes through the nozzle hole 7 impinges on fuel impinging surfaces 18, 18 of the interference bodies 16, 16'.
  • the flow direction of fuel which impinges on the fuel impinging surfaces 18, 18 is sharply changed.
  • the flow of fuel whose flow direction is sharply changed and the flow of fuel which advances straightly in the nozzle hole 7 impinge on each other thus turning the flow of fuel which passes through the nozzle hole 7 and the orifice 8 into a turbulent flow.
  • the corner portions 22 which are formed by the arcuate outer edge portion 21 of the interference body 16 and the circular outlet-side opening portion 15 of the nozzle hole 7 and the corner portions 22 formed by the straight outer edge portion 34 of the interference body 16' and the outlet-side opening portion 15 of the nozzle hole 7 are formed into a non-rounded sharpened and pointed shape and hence, the corner portions 22 are formed into a shape by which an end portion of a liquid film of fuel which passes through the orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the nozzle plate 3 according to this embodiment can further improve the level of atomization of fuel injected from the orifice 8 compared to conventional nozzle plates.
  • the techniques described in the third to fifth embodiments may be applied to the nozzle plates 3 according to this embodiment and respective modifications of this embodiment described hereinafter.
  • Fig. 34 illustrates views showing a nozzle plate 3 according to a first modification of the sixth embodiment.
  • Fig. 34A is a plan view of a portion of the nozzle plate 3
  • Fig. 34B is a partial cross-sectional view of the nozzle plate 3 taken along a line B31-B31 in Fig. 34A .
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the sixth embodiment are given same symbols used for indicating the constitutional portions of the nozzle plate 3 according to the sixth embodiment, and the explanation which overlaps with the explanation of the nozzle plate 3 according to the sixth embodiment is omitted.
  • the nozzle plate 3 according to this modification is characterized in that straight outer edge portions 34, 34 of a first interference body 16' and a second interference body 16' form portions of an orifice 8. That is, in the nozzle plate 3 according to this modification, the first interference body 16' and the second interference body 16' partially close an outlet-side opening portion 15 of a nozzle hole 7, and the orifice 8 is formed by the straight outer edge portions 34, 34 of the first interference body 16' and the second interference body 16', a semicircular outer edge portion (arcuate outer edge portion) 33 of the first interference body 16' and the circular outlet-side opening portion 15 of the nozzle hole 7.
  • a shape of the first and second interference bodies 16' as viewed in a plan view is formed into a shape where both end portions of a rectangular shape in a longitudinal direction are formed into a semicircular shape.
  • a longitudinal direction of the first interference body 16' is arranged along a center line 37 extending parallel to an X axis, and a distal end of the semicircular outer edge portion 33 on one end side abuts against the straight outer edge portion 34 of the second interference body 16'.
  • the second interference body 16' is arranged such that a longitudinal direction of the second interference body 16' becomes parallel to a Y axis, and is formed larger than the first interference body 16'.
  • corner portions 22 formed by the straight outer edge portion 34 of the first interference body 16' and the circular outlet-side opening portion 15 of the nozzle hole 7 are formed into an approximately crescent non-rounded sharpened and pointed shape as viewed in a plan view and hence, the corner portions 22 are formed into a shape by which an end portion of a liquid film of fuel which passes through the orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the corner portions 22 formed by the straight outer edge portion 34 of the second interference body 16' and the circular outlet-side opening portion 15 of the nozzle hole 7 are formed into a non-rounded sharpened and pointed shape and hence, the corner portions 22 are formed into a shape by which an end portion of a liquid film of fuel which passes through the orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the corner portions 22', 22' formed in portions where the semicircular outer edge portion 33 of the first interference body 16' and the straight outer edge portion 34 of the second interference body 16' abut against each other are formed into an approximately crescent non-rounded sharpened and pointed shape as viewed in a plan view. That is, the corner portions 22' 22' are formed into a shape by which an end portion of a liquid film of fuel which passes through the orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the first interference body 16' and the second interference body 16' partially close the outlet-side opening portion 15 of the nozzle hole 7 and hence, a portion of fuel which passes through the nozzle hole 7 impinges on fuel impinging surfaces 18, 18 of the first interference body 16' and the second interference body 16' so that the flow direction of a portion of fuel is sharply changed.
  • the flow of the portion of fuel whose flow direction is sharply changed and the flow of fuel which advances straightly in the nozzle hole 7 impinge on each other thus turning the flow of fuel which passes through the nozzle hole 7 and the orifice 8 into a turbulent flow.
  • the corner portions 22 which are formed by the straight outer edge portion 34 of the first interference body 16' and the circular outlet-side opening portion 15 of the nozzle hole 7, the corner portions 22 formed by the straight outer edge portion 34 of the second interference body 16' and the circular outlet-side opening portion 15 of the nozzle hole 7 and the corner portions 22', 22' which are formed in portions where the semicircular outer edge portion 33 of the first interference body 16' and the straight outer edge portion 34 of the second interference body 16' are brought into contact with each other are formed into a non-rounded sharpened and pointed shape so that the corner portions 22, 22'are formed into a shape by which an end portion of a liquid film of fuel which passes through the orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air. Accordingly, the nozzle plate 3 according to this embodiment can further improve the level of atomization of fuel injected from the orifice 8 compared to conventional nozzle plates.
  • Fig. 35 illustrates views showing a nozzle plate 3 according to a second modification of the sixth embodiment.
  • Fig. 35A is a plan view of a portion of the nozzle plate 3
  • Fig. 35B is a partial cross-sectional view of the nozzle plate 3 taken along a line B32-B32 in Fig. 35A.
  • Fig. 35C is a plan view showing the relationship between a shape of a cavity 89 of a die 87 and a rotary working tool 88
  • Fig. 35D is a cross-sectional view taken along a line B32'-B32' in Fig. 35C .
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the sixth embodiment are given same symbols, and the explanation which overlaps with the explanation of the nozzle plate 3 according to the sixth embodiment is omitted.
  • the nozzle plate 3 according to this modification is characterized in that straight outer edge portions 86, 86 of a V-shaped interference body 16a form portions of an orifice 8. That is, in the nozzle plate 3 according to this modification, an interference body 16 and the V-shaped interference body 16a partially close an outlet-side opening portion 15 of a nozzle hole 7, and the orifice 8 is formed by an arcuate outer edge portion 21 of the interference body 16, straight outer edge portions (outer edge portions) 86, 86 of the V-shaped interference body 16a, and the circular outlet-side opening portion 15 of the nozzle hole 7.
  • the interference body 16 is formed into a circular shape as viewed in a plan view.
  • the V-shaped interference body 16a is formed into a shape where a pair of interference bodies 16', 16' abut against each other in a V shape as viewed in a plan view. As shown in Fig. 35C and 35D , the V-shaped interference body 16a is formed such that a V-shaped cavity 89 for injection molding is formed by cutting or grinding the die 87 by the rotary working tool (end mill or the like) 88, and a molten resin is injected into the cavity 89 formed in the die 87.
  • the inner side walls 90, 90 of the cavity 89 formed into a V shape are side walls for forming straight outer edge portions 86, 86 positioned so as to close the nozzle hole 7.
  • a side surface 17a of the V-shaped interference body 16a is, in the same manner as the side surface 17 of the inference body 16 having a frustoconical shape, formed such that a side surface 17a intersects with a fuel impinging surface 18 at an acute angle.
  • the interference body 16 is formed such that the center of the interference body 16 is positioned on a center line 37 of the nozzle hole 7 extending in a direction along an X axis.
  • a distal end of the corner portion 92 formed by the pair of straight outer edge portions 86, 86 which intersect with each other in a V shape is positioned on the center line 37 of the nozzle hole 7 extending in the direction along the X axis, and the distal end of the corner portion 92 formed by the pair of straight outer edge portions 86, 86 which intersects with each other in a V shape is positioned on an opening edge of the outlet-side opening portion 15.
  • the V-shaped interference body 16a is formed into a line symmetrical shape using the center line 37 of the nozzle hole 7 extending in the direction along the X axis as an axis of symmetry.
  • the interference body 16 and the V-shaped interference body 16a partially close the circular outlet-side opening portion 15 of the nozzle hole 7, and the orifice 8 is formed by the arcuate outer edge portion 21 of the interference body 16, the pair of straight outer edge portions 86, 86 of the V-shaped interference body 16a and the circular outlet-side opening portion 15 of the nozzle hole 7.
  • Corner portions 22 formed by the arcuate outer edge portion 21 of the interference body 16 and the circular outlet-side opening portion 15 of the nozzle hole 7 are formed into a crescent non-rounded sharpened and pointed shape as viewed in a plan view.
  • corner portions 22 are formed into a sharpened and pointed shape by which an end portion of a liquid film of fuel which passes through the orifice 8 is easily atomized by a friction between the end portion of the liquid film of fuel and air.
  • Corner portions 22 formed by the straight outer edge portions 86, 86 of the V-shaped interference body 16a and the circular outlet-side opening portion 15 of the nozzle hole 7 are formed into a non-rounded sharpened and pointed shape. That is, the corner portions 22 are formed into a shape by which an end portion of a liquid film of fuel which passes through the orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the V-shaped corner portion 92 of the V-shaped interference body 16a is formed into a non-rounded sharpened and pointed shape. That is, the corner portion 92 is formed into a shape by which an end portion of a liquid film of fuel which passes through the orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the interference body 16 and the V-shaped interference body 16a partially close the outlet-side opening portion 15 of the nozzle hole 7 and hence, a portion of fuel which passes through the nozzle hole 7 impinges on fuel impinging surfaces 18, 18 of the interference body 16 and the V-shaped interference body 16a so that the flow direction of a portion of fuel is sharply changed.
  • the flow of the portion of fuel whose flow direction is sharply changed and the flow of fuel which advances straightly in the nozzle hole 7 impinge on each other thus turning the flow of fuel which passes through the nozzle hole 7 and the orifice 8 into a turbulent flow.
  • the corner portions 22 formed by the arcuate outer edge portion 21 of the interference body 16 and the circular outlet-side opening portion 15 of the nozzle hole 7, the corner portions 22 formed by the straight outer edge portions 86, 86 of the V-shaped interference body 16a and the circular outlet-side opening portion 15 of the nozzle hole 7, and the V-shaped corner portion 92 of the V-shaped interference body 16a are formed into a non-rounded sharpened and pointed shape so that the corner portions 92 are formed into a shape by which an end portion of a liquid film of fuel which passes through the orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air. Accordingly, the nozzle plate 3 according to this modification can further improve the level of atomization of fuel injected from the orifice 8 compared to conventional nozzle plates.
  • Fig. 36 illustrates views showing a nozzle plate 3 according to a third modification of the sixth embodiment and views showing a modification of the nozzle plate 3 according to the second modification of the sixth embodiment.
  • Fig. 36A is a plan view of a portion of the nozzle plate 3
  • Fig. 36B is a partial cross-sectional view of the nozzle plate 3 taken along a line B33-B33 in Fig. 36A .
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the second modification are given same symbols used for indicating the constitutional parts of the nozzle plate 3 according to the second modification, and the explanation which overlaps with the explanation of the nozzle plate 3 according to the second modification is omitted.
  • the nozzle plate 3 according to this modification shown in Fig. 36 is characterized in that an opening area of an orifice 8 is narrowed by arranging a V-shaped interference body 16a closer to an interference body 16 compared to the nozzle plate 3 according to the second modification.
  • a distal end of a V-shaped corner portion 92 is positioned inside an outlet-side opening portion 15 of a nozzle hole 7 in a radial direction.
  • the nozzle plate 3 according to this modification having such a configuration can acquire substantially the same advantageous effects as the nozzle plate 3 according to the second modification, the nozzle plate 3 according to this modification can reduce a film thickness of a liquid film of fuel which passes through the orifice 8 as a whole thus further effectively improving the level of atomization of fuel injected from the orifice 8.
  • Fig. 37 illustrates views showing a nozzle plate 3 according to a fourth modification of the sixth embodiment and views showing a modification of the nozzle plate 3 according to the second modification of the sixth embodiment.
  • Fig. 37A is a plan view of a portion of the nozzle plate 3
  • Fig. 37B is a partial cross-sectional view of the nozzle plate 3 taken along a line B34-B34 in Fig. 37A .
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the second modification are given same symbols used for indicating the constitutional parts of the nozzle plate 3 according to the second modification, and the explanation which overlaps with the explanation of the nozzle plate 3 according to the second modification is omitted.
  • the nozzle plate 3 according to this modification shown in Fig. 37 is characterized in that, compared to the nozzle plate 3 according to the second modification, an opening angle of a pair of straight outer edge portions 86, 86 of a V-shaped interference body 16a which intersects with each other in a V shape (an intersecting angle made by the pair of straight outer edge portions 86, 86) is set at an acute angle, and the pair of straight outer edge portions 86, 86 of the V-shaped interference body 16a which intersects with each other in a V shape are brought into contact with an arcuate outer edge portion 21 of an interference body 16.
  • Corner portions 22' formed at portions where the straight outer edge portions 86 of the V-shaped interference body 16a and the arcuate outer edge portions 21 of the interference body 16 are brought into contact with each other are formed into an approximately crescent non-rounded sharpened and pointed shape as viewed in a plan view. Accordingly, an end portion of a liquid film of fuel which passes through the orifice 8 is formed into a shape by which the end portion of the liquid film of fuel is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the V-shaped corner portion 92 of the V-shaped interference body 16a is formed into a non-rounded sharpened and pointed shape and hence, an end portion of a liquid film of fuel which passes through the orifice 8 is formed into a shape by which the end portion of the liquid film of fuel is easily atomized due to a friction between the end portion of the liquid film of fuel and air. Accordingly, the nozzle plate 3 according to this embodiment can further improve the level of atomization of fuel injected from the orifice 8 compared to conventional nozzle plates.
  • the V-shaped corner portion 92 of the V-shaped interference body 16a may be arranged outside the outlet-side opening portion 15 of the nozzle hole 7 in the radial direction, and a non-rounded sharpened and pointed corner portion (not shown in the drawing) may be formed by a pair of straight outer edge portions 86, 86 of the V-shaped interference body 16a and the outlet-side opening portion 15 of the nozzle hole 7.
  • Fig. 38 illustrates views showing a nozzle plate 3 according to a fifth modification of the sixth embodiment and views showing a modification of the nozzle plate 3 according to the second modification of the sixth embodiment.
  • Fig. 38A is a plan view of a portion of the nozzle plate 3
  • Fig. 38B is a side view of a portion of the nozzle plate 3 with a part broken away.
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the second modification are given same symbols used for indicating the constitutional parts of the nozzle plate 3 according to the second modification, and the explanation which overlaps with the explanation of the nozzle plate 3 according to the second modification is omitted.
  • a pair of interference bodies 16, 16 and a V-shaped interference body 16a partially close an outlet-side opening portion 15 of a nozzle hole 7.
  • an orifice 8 is formed by arcuate outer edge portions 21, 21 of the pair of interference bodies 16, 16, a pair of straight outer edge portions 86, 86 of the V-shaped interference body 16a, and the outlet-side opening portion 15 of the nozzle hole 7.
  • the pair of interference bodies 16, 16 are brought into contact with each other on a center line 35 which extends along a Y axis of the nozzle hole 7 and on an opening edge of the outlet-side opening portion 15.
  • the pair of straight outer edge portions 86, 86 of the V-shaped interference body 16a is brought into contact with the arcuate outer edge portions 21, 21 of the interference bodies 16, 16 on an outer side of the nozzle hole 7 in the radial direction, and is formed in a line symmetry shape using the center axis 35 which extends along the Y axis of the nozzle hole 7 as an axis of symmetry.
  • a V-shaped corner portion 92 of a V-shaped interference body 16a is positioned more inside in the radial direction than the opening edge of the outlet-side opening portion 15.
  • corner portions 22 formed by the arcuate outer edge portion 21 of the interference body 16 and the outlet-side opening portion 15 of the nozzle hole 7 are formed into a non-rounded sharpened and pointed shape
  • corner portions 22 formed by the straight outer edge portions 86 of the V-shaped interference body 16a and the outlet-side opening portion 15 of the nozzle hole 7 are formed into a non-rounded sharpened and pointed shape
  • corner portions 22' formed due to a contact between the arcuate outer edge portions 21, 21 of the pair of interference bodies 16, 16 are formed into a non-rounded sharpened and pointed shape.
  • the V-shaped corner portion 92 of the V-shaped interference body 16a is formed into a non-rounded sharpened and pointed shape.
  • the pair of interference bodies 16, 16 and the V-shaped interference body 16a partially close the outlet-side opening portion 15 of the nozzle hole 7 and hence, a portion of fuel which passes through the nozzle hole 7 impinges on fuel impinging surfaces 18 of the pair of interference bodies 16, 16 and the V-shaped interference body 16a so that the flow direction of a portion of fuel is sharply changed.
  • the flow of the portion of fuel whose flow direction is sharply changed and the flow of fuel which advances straightly in the nozzle hole 7 impinge on each other thus turning the flow of fuel which passes through the nozzle hole 7 and the orifice 8 into a turbulent flow.
  • the corner portions (22, 22', 92) of the orifice 8 in six places are formed into a non-rounded sharpened and pointed shape and hence, an end portion of a liquid film of fuel which passes through the orifice 8 is easily atomized due to a friction between the end portion of the liquid film of fuel and air. Accordingly, the nozzle plate 3 according to this modification can further improve the level of atomization of fuel injected from the orifice 8 compared to conventional nozzle plates.
  • Fig. 39 illustrates views showing a nozzle plate 3 according to a sixth modification of the sixth embodiment.
  • Fig. 39A is a plan view of a portion of the nozzle plate 3
  • Fig. 39B is a partial cross-sectional view of the nozzle plate 3 taken along a line B35-B35 in Fig. 39A .
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the sixth embodiment are given same symbols used for indicating the constitutional parts of the nozzle plate 3 according to the first embodiment, and the explanation which overlaps with the explanation of the nozzle plate 3 according to the first embodiment is omitted.
  • a nozzle plate 3 according to this modification is characterized in that a straight outer edge portion 34 of an interference body 16' forms a part of an orifice 8, and arcuate outer edge portions 21, 21 of a pair of interference bodies 16, 16 which are positioned in a spaced-apart manner from each other form parts of the orifice 8. That is, in the nozzle plate 3 according to this modification, the pair of interference bodies 16, 16 and the interference body 16' partially close a circular outlet-side opening portion 15 of a nozzle hole 7, and the orifice 8 is formed by the arcuate outer edge portions 21, 21 of the pair of interference bodies 16, 16, a straight outer edge portion 34 of the interference body 16' and the circular outlet-side opening portion 15 of the nozzle hole 7.
  • Corner portions 22 formed by the arcuate outer edge portions 21, 21 of the interference bodies 16, 16 and the circular outlet-side opening portion 15 of the nozzle hole 7 are formed into a non-rounded sharpened and pointed shape as viewed in a plan view and hence, an end portion of a liquid film of fuel which passes through the orifice 8 is formed into a sharpened shape by which the end portion of the liquid film of fuel is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • corner portions 22 formed by the straight outer edge portion 34 of the interference body 16' and the outlet-side opening portion 15 of the nozzle hole 7 are formed into a non-rounded sharpened and pointed shape and hence, an end portion of a liquid film of fuel which passes through the orifice 8 is formed into a shape by which the end portion of the liquid film of fuel is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the pair of interference bodies 16, 16 is positioned in a spaced-apart manner from each other in line symmetry using the center axis 35 which extends parallel to a Y axis as an axis of symmetry. Further, the center position of the interference body 16' in the longitudinal direction is formed so as to be positioned on the center line 35 which extends in a direction along the Y axis of the nozzle hole 7.
  • the pair of interference bodies 16, 16 and the interference body 16' partially close the outlet-side opening portion 15 of the nozzle hole 7 and hence, a portion of fuel which passes through the nozzle hole 7 impinges on fuel impinging surfaces 18 of the pair of interference bodies 16, 16 and the interference body 16' so that the flow direction of a portion of fuel which impinges on the fuel impinging surfaces 18 is sharply changed.
  • the flow of the portion of fuel whose flow direction is sharply changed and the flow of fuel which advances straightly in the nozzle hole 7 impinge on each other thus turning the flow of fuel which passes through the nozzle hole 7 and the orifice 8 into a turbulent flow.
  • the corner portions 22 formed by the arcuate outer edge portions 21, 21 of the pair of interference bodies 16, 16 and the outlet-side opening portion 15 of the nozzle hole 7 and the corner portions 22 formed by the straight outer edge portion 34 of the interference body 16' and the outlet-side opening portion 15 of the nozzle hole 7 are formed into a non-rounded sharpened and pointed shape so that an end portion of a liquid film of fuel which passes through the orifice 8 is formed into a shape by which the end portion of the liquid film of fuel is easily atomized due to a friction between the end portion of the liquid film of fuel and air. Accordingly, the nozzle plate 3 according to this modification can further improve the level of atomization of fuel injected from the orifice 8 compared to conventional nozzle plates.
  • Fig. 40 illustrates views showing a nozzle plate 3 according to a seventh modification of the sixth embodiment and views showing a modification of the sixth modification of the sixth embodiment.
  • Fig. 40A is a plan view of a portion of the nozzle plate 3
  • Fig. 40B is a partial cross-sectional view of the nozzle plate 3 taken along a line B36-B36 in Fig. 40A .
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the sixth modification are given same symbols used for indicating the constitutional parts of the nozzle plate 3 according to the sixth modification, and the explanation which overlaps with the explanation of the nozzle plate 3 according to the sixth modification is omitted.
  • a straight outer edge portion 34 of an interference body 16' is made to abut against arcuate outer edge portions 21, 21 of a pair of interference bodies 16, 16, and the pair of interference bodies 16, 16 and the interference body 16' partially close a circular outlet-side opening portion 15 of a nozzle hole 7.
  • an orifice 8 is formed by the arcuate outer edge portions 21, 21 of the pair of interference bodies 16, 16, the straight outer edge portion 34 of the interference body 16' and the outlet-side opening portion 15 of the nozzle hole 7.
  • corner portions 22' formed by the arcuate outer edge portions 21, 21 of the pair of interference bodies 16, 16 and the straight outer edge portion 34 of the interference body 16' are formed into a non-rounded sharpened and pointed shape so that an end portion of a liquid film of fuel which passes through the orifice 8 is formed into a shape by which the end portion of the liquid film of fuel is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • corner portions 22 formed by the arcuate outer edge portions 21, 21 of the interference bodies 16, 16 and the outlet-side opening portion 15 of the nozzle hole 7 are formed into a non-rounded sharpened and pointed shape so that an end portion of a liquid film of fuel which passes through the orifice 8 is formed into a shape by which the end portion of the liquid film of fuel is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the pair of interference bodies 16, 16 and the interference body 16' partially close the circular outlet-side opening portion 15 of the nozzle hole 7 and hence, a portion of fuel which passes through the nozzle hole 7 impinges on fuel impinging surfaces 18 of the pair of interference bodies 16, 16 and the interference body 16' so that the flow direction of a portion of fuel is sharply changed.
  • the flow of the portion of fuel whose flow direction is sharply changed and the flow of fuel which advances straightly in the nozzle hole 7 impinge on each other thus turning the flow of fuel which passes through the nozzle hole 7 and the orifice 8 into a turbulent flow.
  • the respective corner portions 22, 22' of the orifice 8 are formed into a non-rounded sharpened and pointed shape so that an end portion of a liquid film of fuel which passes through the orifice 8 is formed into a shape by which the end portion of the liquid film of fuel is easily atomized due to a friction between the end portion of the liquid film of fuel and air. Accordingly, the nozzle plate 3 according to this modification can further improve the level of atomization of fuel injected from the orifice 8 compared to conventional nozzle plates.
  • Fig. 41 illustrates views showing a nozzle plate 3 according to an eighth modification of the sixth embodiment and also views showing a modification of the sixth modification of the sixth embodiment.
  • Fig. 41 A is a plan view of a portion of the nozzle plate 3
  • Fig. 41 B is a side view of a portion of the nozzle plate 3.
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the sixth modification are given same symbols used for indicating the constitutional parts of the nozzle plate 3 according to the sixth modification, and the explanation which overlaps with the explanation of the nozzle plate 3 according to the sixth modification is omitted.
  • arcuate outer edge portions 21, 21 of a pair of interference bodies 16, 16 are made to abut against each other, and the pair of interference bodies 16, 16 and the interference body 16' partially close a circular outlet-side opening portion 15 of a nozzle hole 7.
  • an orifice 8 is formed by the arcuate outer edge portions 21, 21 of the pair of interference bodies 16, 16, the straight outer edge portion 34 of the interference body 16' and the circular outlet-side opening portion 15 of the nozzle hole 7.
  • a corner portion 22' formed in a portion where the arcuate outer edge portions 21, 21 of the pair of interference bodies 16, 16 abut against each other is formed into a non-rounded sharpened and pointed shape so that an end portion of a liquid film of fuel which passes through the orifice 8 is formed into a shape by which the end portion of the liquid film of fuel is easily atomized due to a friction between the end portion of liquid film of fuel and air.
  • the corner portions 22 formed by the arcuate outer edge portions 21, 21 of the pair of interference bodies 16, 16 and the circular outlet-side opening portion 15 of the nozzle hole 7 are formed into a non-rounded sharpened and pointed shape so that an end portion of a liquid film of fuel which passes through the orifice 8 is formed into a shape by which the end portion of the liquid film of fuel is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • corner portions 22 formed by the straight outer edge portion 34 of the interference boy 16' and the outlet-side opening portion 15 of the nozzle hole 7 are formed into a non-rounded sharpened and pointed shape so that an end portion of a liquid film of fuel which passes through the orifice 8 is formed into a shape by which the end portion of the liquid film of fuel is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the pair of interference bodies 16, 16 and the interference body 16' partially close the circular outlet-side opening portion 15 of the nozzle hole 7 and hence, a portion of fuel which passes through the nozzle hole 7 impinges on fuel impinging surfaces 18 of the pair of interference bodies 16, 16 and the interference body 16' so that the flow direction of a portion of fuel is sharply changed.
  • the flow of the portion of fuel whose flow direction is sharply changed and the flow of fuel which advances straightly in the nozzle hole 7 impinge on each other thus turning the flow of fuel which passes through the nozzle hole 7 and the orifice 8 into a turbulent flow.
  • the respective corner portions 22, 22' of the orifice 8 are formed into a non-rounded sharpened and pointed shape so that an end portion of a liquid film of fuel which passes through the orifice 8 is formed into a shape by which the end portion of the liquid film of fuel is easily atomized due to a friction between the end portion of the liquid film of fuel and air. Accordingly, the nozzle plate 3 according to this modification can further improve the level of atomization of fuel injected from the orifice 8 compared to conventional nozzle plates.
  • Fig. 42 illustrates views showing a nozzle plate 3 according to a ninth modification of the sixth embodiment.
  • Fig. 42A is a plan view of a portion of the nozzle plate 3
  • Fig. 42B is a cross-sectional view of the nozzle plate 3 taken along a line B37-B37 in Fig. 42A .
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the sixth embodiment are given same symbols used for indicating the constitutional parts of the nozzle plate 3 according to the sixth modification, and the explanation which overlaps with the explanation of the nozzle plate 3 according to the sixth embodiment is omitted.
  • the interference body 16 of the nozzle plate 3 according to the sixth embodiment is omitted. That is, the nozzle plate 3 is configured such that an outlet-side opening portion 15 of a nozzle hole 7 is partially closed only by an interference body 16'.
  • corner portions 22 of the orifice 8 formed by a straight outer edge portion 34 of the interference boy 16' and a circular outlet-side opening portion 15 of the nozzle hole 7 are formed into a non-rounded sharpened and pointed shape so that an end portion of a liquid film of fuel which passes through the orifice 8 is formed into a shape by which the end portion of the liquid film of fuel is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • a portion of fuel which passes through the nozzle hole 7 impinges on a fuel impinging surface 18 of the interference body 16', so that the flow direction of the fuel which impinges on the fuel impinging surface 18 is sharply changed.
  • the nozzle plate 3 according to this modification can further improve the level of atomization of fuel injected from the orifice 8 compared to conventional nozzle plates.
  • Fig. 43 illustrates views showing a nozzle plate 3 according to a tenth modification of the sixth embodiment and views showing a modification of the nozzle plate 3 according to the ninth modification of the sixth embodiment.
  • Fig. 43A is a plan view of a portion of the nozzle plate 3
  • Fig. 43B is a cross-sectional view of the nozzle plate 3 taken along a line B38-B38 in Fig. 43A .
  • Fig. 43 illustrates views showing a nozzle plate 3 according to a tenth modification of the sixth embodiment and views showing a modification of the nozzle plate 3 according to the ninth modification of the sixth embodiment.
  • Fig. 43A is a plan view of a portion of the nozzle plate 3
  • Fig. 43B is a cross-sectional view of the nozzle plate 3 taken along a line B38-B38 in Fig. 43A .
  • Fig. 43 illustrates views showing a nozzle plate 3 according to a tenth modification of the sixth embodiment and views showing a modification
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the ninth modification of the sixth embodiment are given same symbols used for indicating the constitutional parts of the nozzle plate 3 according to the ninth modification of the sixth embodiment, and the explanation which overlaps with the explanation of the nozzle plate 3 according to the ninth modification of the sixth embodiment is omitted.
  • an area of an outlet-side opening portion 15 of a nozzle hole 7 closed by an interference body 16' is set larger than an area of the outlet-side opening portion 15 closed by the interference body 16' in the nozzle plate 3 according to the ninth modification, and an opening area of the orifice 8 formed by a straight outer edge portion 34 of the interference body 16' and a circular outlet-side opening portion 15 of the nozzle hole 7 is set smaller than an opening area of the orifice 8 formed in the nozzle plate 3 according to the ninth modification.
  • a corner portion 22 of an orifice 8 formed by a straight outer edge portion 34 of the interference body 16' and a circular outlet-side opening portion 15 of the nozzle hole 7 is pointed more sharply than the corresponding corner portion 22 of the orifice 8 formed in the nozzle plate 3 according to the ninth modification.
  • the nozzle plate 3 according to this modification can acquire substantially the same advantageous effects as the nozzle plate 3 according to the ninth modification
  • the nozzle plate 3 according to this modification has a fuel injection characteristic different from that of the nozzle plate 3 according to the ninth modification.
  • the fuel injection direction is largely inclined with respect to a center axis Co of the nozzle hole 7 compared to the nozzle plate 3 according to the ninth modification.
  • Fig. 44 illustrates views showing a nozzle plate 3 according to an eleventh modification of the sixth embodiment and views showing a modification of the nozzle plate 3 according to the fourth modification of the sixth embodiment.
  • Fig. 44A is a plan view of a portion of the nozzle plate 3
  • Fig. 44B is a cross-sectional view of the nozzle plate 3 taken along a line B39-B39 in Fig. 44A .
  • Fig. 44 illustrates views showing a nozzle plate 3 according to an eleventh modification of the sixth embodiment and views showing a modification of the nozzle plate 3 according to the fourth modification of the sixth embodiment.
  • Fig. 44A is a plan view of a portion of the nozzle plate 3
  • Fig. 44B is a cross-sectional view of the nozzle plate 3 taken along a line B39-B39 in Fig. 44A .
  • Fig. 44A is a plan view of a portion of the nozzle plate 3
  • Fig. 44B is a cross-sectional view of
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the fourth modification of the sixth embodiment are given same symbols used for indicating the constitutional parts of the nozzle plate 3 according to the fourth modification of the sixth embodiment, and the explanation which overlaps with the explanation of the nozzle plate 3 according to the fourth modification of the sixth embodiment is omitted.
  • the nozzle plate 3 according to this modification adopts the structure where the interference body 16 of the nozzle plate 3 according to the fourth modification of the sixth embodiment is omitted, and an outlet-side opening portion 15 of the nozzle hole 7 is partially closed by a V-shaped interference body 16a.
  • corner portions 22 formed by a pair of straight outer edge portions 86, 86 and a circular outlet-side opening portion 15 of the nozzle hole 7 and a V-shaped corner portion 92 formed at a portion where the pair of straight outer edge portions 86, 86 intersect with each other are formed into a non-rounded sharpened and pointed shape so that an end portion of a liquid film of fuel which passes through the orifice 8 is formed into a shape by which the end portion of the liquid film of fuel is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the nozzle plate 3 according to this modification a portion of fuel which passes through the nozzle hole 7 impinges on a fuel impinging surface 18 of the V-shaped interference body 16a so that the flow direction of the fuel which impinges on the fuel impinging surface 18 is sharply changed.
  • the flow of the portion of fuel whose flow direction is sharply changed and the flow of fuel which advances straightly in the nozzle hole 7 impinge on each other thus turning the flow of fuel which passes through the nozzle hole 7 and the orifice 8 into a turbulent flow. Accordingly, the nozzle plate 3 according to this modification can further improve the level of atomization of fuel injected from the orifice 8 compared to conventional nozzle plates.
  • Fig. 45 illustrates views showing a nozzle plate 3 according to a twelfth modification of the sixth embodiment and views showing a modification of the nozzle plate 3 according to the ninth modification of the sixth embodiment.
  • Fig. 45A is a plan view of a portion of the nozzle plate 3
  • Fig. 45B is a cross-sectional view of the nozzle plate 3 taken along a line B40-B40 in Fig. 45A .
  • Fig. 45A is a plan view of a portion of the nozzle plate 3
  • Fig. 45B is a cross-sectional view of the nozzle plate 3 taken along a line B40-B40 in Fig. 45A .
  • constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 according to the ninth modification are given same symbols used for indicating the constitutional parts of the nozzle plate 3 according to the ninth modification, and the explanation which overlaps with the explanation of the nozzle plate 3 according to the ninth modification of the sixth embodiment is omitted.
  • interference bodies 16' are formed around an outlet-side opening portion 15 of a nozzle hole 7 in three places at equal intervals.
  • an orifice 8 is formed by straight outer edge portions 34 of the interference bodies 3 in three places and the circular outlet-side opening portion 15 of the nozzle hole 7.
  • corner portions 22 in six places which are formed by the straight outer edge portions 34 of the interference bodies 16' in three places and the circular outlet-side opening portion 15 of the nozzle hole 7 are formed into a non-rounded sharpened and pointed shape so that an end portion of a liquid film of fuel which passes through the orifice 8 is formed into a shape by which the end portion of the liquid film of fuel is easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the nozzle plate 3 according to this modification a portion of fuel which passes through the nozzle hole 7 impinges on a fuel impinging surface 18 of the V-shaped interference body 16a so that the flow direction of the fuel which impinges on the fuel impinging surface 18 is sharply changed.
  • the flow of the portion of fuel whose flow direction is sharply changed and the flow of fuel which advances straightly in the nozzle hole 7 impinge on each other thus turning the flow of fuel which passes through the nozzle hole 7 and the orifice 8 into a turbulent flow. Accordingly, the nozzle plate 3 according to this modification can further improve the level of atomization of fuel injected from the orifice 8 compared to conventional nozzle plates.
  • Fig. 46 and Fig. 47 illustrate views showing a nozzle plate 3 according to a seventh embodiment of the present invention.
  • Fig. 46A is a front view of the nozzle plate 3 according to this embodiment
  • Fig. 46B is a cross-sectional view of the nozzle plate 3 taken along a line B41-B41 in Fig. 46A
  • Fig. 46C is a cross-sectional view of the nozzle plate 3 taken along a line B42-B42 in Fig. 46A
  • Fig. 46D is a back view of the nozzle plate 3 according to this embodiment.
  • Fig. 47A is an enlarged view of a portion (center portion) of the nozzle plate 3 in Fig. 46A , Fig.
  • Fig. 47B is a partially enlarged view of the nozzle plate 3 showing a nozzle hole 7 and an area in the vicinity of the nozzle hole 7 in an enlarged manner
  • Fig. 47C is an enlarged cross-sectional view taken along a line B43-B43 in Fig. 47B .
  • a nozzle plate body 9 includes: a cylindrical wall portion 10 fitted into a distal end side of a valve body 5; and a bottom wall portion 11 formed so as to close one end side of the cylindrical wall portion 10 (see Fig. 2 ).
  • the bottom wall portion 11 has: nozzle hole plate portions 64 in which nozzle holes 7 are formed; and an interference body plate portion 63 on which interference bodies 65 are formed.
  • the interference body plate portion 63 is formed such that a conical projection 94 having a rounded distal end is formed at the center (the position being aligned with the center axis 53) of the bottom wall portion 11, and a portion of the bottom wall portion 11 around the conical projection 94 is counterbored in a disc shape.
  • the nozzle hole plate portions 64 are formed by partially counterboring portions of the interference body plate portion 63 around the nozzle hole 7 thus having a smaller wall thickness than the interference body plate portion 63.
  • the nozzle holes 7 are formed in the bottom wall portion 11 in four places at equal intervals about a center axis 53, and a portion of the nozzle hole 7 penetrates the nozzle hole plate portion 64 from a front side to a back side (such that portions of the nozzle hole 7 open on the front and back sides). As shown in Fig. 47A , the respective nozzle holes 7 are formed such that centers 7a of the nozzle holes 7 are positioned on center lines 95, 96 (the straight line 95 which passes a center axis 53 and is parallel to an X axis, and the straight line 96 which passes the center axis 53 and is parallel to a Y axis) of the bottom wall portion 11.
  • interference bodies 65 which close portions of the nozzle hole 7 are formed in three places for each one nozzle hole 7.
  • the interference bodies 65 in three places are formed such that an orifice 8 which has a line-symmetry shape with respect to a straight line 97 orthogonal to the center line 95 (96) which passes the center 7a of the nozzle hole is formed. Accordingly, a center direction 98 of spraying of fuel injected from the orifice 8 is inclined toward the +Y direction side with respect to the center axis 7c of the nozzle hole 7, and the center direction 98 of the spraying of fuel injected from the orifice 8 extends along the straight line 97.
  • the center directions 98 of the spraying of fuel injected from four orifices 8 are arranged in the counterclockwise direction about the center axis 53 of the bottom wall portion 11. As a result, the spraying of fuel injected from four orifices 8 forms a swirling flow in the counterclockwise direction about the center axis 53 of the bottom wall portion 11.
  • the interference bodies 65 formed on the interference body plate portion 63 in three places have the same shape as portions of the interference body 16 described in the first embodiment, and form the orifice 8 by partially closing the nozzle hole 7. Corner portions 22 formed by an arcuate outer edge portion 66 of the interference body 65 and an outlet-side opening portion 15 of the nozzle hole 7 are formed into a non-rounded sharpened shape so that an end portion of a liquid film of fuel which passes through the orifice 8 can be easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • the orifice 8 of the nozzle plate 3 according to this embodiment has substantially the same shape as the orifice 8 shown in Fig. 31 A .
  • nozzle plate 3 The explanation of the nozzle plate 3 according to this embodiment is made with reference to Fig. 47 such that constitutional portions substantially equal to the constitutional portions of the nozzle plate 3 shown in Fig. 31 A are given the same symbols, and the explanation which overlaps with the explanation of the nozzle plate 3 shown in Fig. 31 A is omitted when appropriate.
  • each of the interference bodies 65 formed on the interference body plate portion 63 in three places has a fuel impinging surface 68 and a side surface (inclined surface) 67 substantially equal to the fuel impinging surface 68 and the side surface (inclined surface) 67 of the interference body 65 according to the fourth embodiment shown in Fig. 31 .
  • the fuel impinging surface 68 and the side surface 67 of the interference body 65 can acquire the substantially same advantageous effects as the fuel impinging surface 68 and the side surface 67 of the interference body 65 described in the fourth embodiment.
  • Eight blades 100 having the same shape are integrally formed on the bottom wall portion 11 such that the blades 100 are positioned around the center axis 53 at equal intervals and radially outside the interference body plate portion 63.
  • the blade 100 has an arcuate shape as viewed in a plan view, and has a fixed wall thickness over a range from a radially inner end to a radially outer end thereof.
  • the blade 100 is formed by cutting in an oblique upward direction from a radially inner end thereof so as to prevent the blade 100 from interrupting spraying of fuel injected from the orifices 8 thus forming a fuel impinge avoiding portion 101 so as to ensure a sufficient space where spraying state of fuel injected from the orifices 8 is minimally affected.
  • the blade 100 is formed to have the same blade height except for the fuel impinge avoiding portion 101 formed on a radially inner end side of the blade 100.
  • a distance between a pair of blades 100, 100 arranged adjacent to each other is narrowed toward a radially inside from a radially outside so that a blade groove 102 defined between the blades 100 is narrowed toward the radially inside from the radially outside.
  • nozzle hole 7 having the center thereof on the center line 95 which extends in the +X axis direction as a first nozzle hole 7, and assume the respective nozzle holes 7 which are displaced from the first nozzle hole 7 at intervals of 90° in the counterclockwise direction as second to fourth nozzle holes 7.
  • nozzle hole 7 having the center thereof on the center line 95 which extends in the +X axis direction as a first nozzle hole 7
  • respective nozzle holes 7 which are displaced from the first nozzle hole 7 at intervals of 90° in the counterclockwise direction as second to fourth nozzle holes 7.
  • a center line 103 of the fifth blade groove 102 passes the center of the fourth nozzle hole 7.
  • a center line 103 of the seventh blade groove 102 passes the center of the first nozzle hole 7.
  • a center line 103 of the second blade groove 102 passes an area in the vicinity of the second nozzle hole 7.
  • a center line 103 of the fourth blade groove 102 passes an area in the vicinity of the third nozzle hole 7.
  • a center line 103 of the sixth blade groove 102 passes an area in the vicinity of the fourth nozzle hole 7.
  • a center line 103 of the eighth blade groove 102 passes an area in the vicinity of the first nozzle hole 7.
  • the center lines 103 of these first to eighth blade grooves 102 are positioned so as to pass an area around the center axis 53 of the bottom wall portion 11.
  • the flow of air flowed out from the radially inner ends of the first to eighth blade grooves 102 moves away from the center axis 53 of the bottom wall portion 11 by a predetermined distance (at least by an amount corresponding to a shape of the conical projection 94) thus generating a swirling flow in the counterclockwise direction having the center thereof at the center axis 53 of the bottom wall portion 11.
  • Atomized droplets (fine particles of fuel) in sprayed fuel have a momentum (a velocity component in the counterclockwise direction) so that the droplets entrap surrounding air and swirling air, and impart the momentum to the entrapped air. Air which acquires the momentum forms a spiral flow and conveys droplets (fine particles of fuel).
  • the droplets (fine particles of fuel) in sprayed fuel are conveyed by the spiral air flow so that scattering of the droplet to the surrounding can be prevented. Accordingly, in the nozzle plate 3 according to this embodiment, an amount of fuel stuck to a wall surface or the like of the intake pipe 2 can be made small and hence, utilization efficiency of fuel can be improved (see Fig. 1 ).
  • the nozzle plate 3 in the nozzle plate 3 according to this embodiment, eight blades 100 are integrally formed on the bottom wall portion 11 such that the blades 100 are positioned around the center axis 53 at equal intervals from each other and radially outside the interference body plate portion 63. Accordingly, at the time of assembling the nozzle plate 3 to the valve body 5, it is possible to prevent tools or the like from impinging on the nozzle hole 7 and an area around the nozzle hole 7 by means of the blades 100. It is also possible to prevent the damage on the nozzle holes 7 formed in the bottom wall portion 11 and areas around the nozzle holes 7 by means of the blades 100.
  • the nozzle plate 3 when the fuel injection device 1 where the nozzle plate 3 is assembled to the valve body 5 is assembled to the intake pipe 2 of an engine, it is possible to prevent engine parts or the like from impinging on the nozzle hole 7 and an area around the nozzle hole 7 by means of the blades 100 and hence, it is possible to prevent the nozzle holes 7 formed in the bottom wall portion 11 and portions of the bottom wall portion 11 around the nozzle holes 7 from being damaged by means of the blades 100.
  • Fig. 48 illustrates views showing a first modification of the nozzle plate 3 according to the seventh embodiment of the present invention.
  • Fig. 48A is a front view of the nozzle plate 3, and is also a view which corresponds to Fig. 46A .
  • Fig. 48B is a view showing a center portion of the nozzle plate 3 in an enlarged manner, and is also a view which corresponds to Fig. 47A .
  • interference bodies 65 are formed for each nozzle hole 7 in three places such that a center direction 98 of spraying of fuel injected from each orifice 8 is directed to a center 7a of another nozzle hole 7 arranged adjacent to the nozzle hole 7 (positioned on a front side in the fuel injecting direction). That is, the nozzle plate 3 according to this modification is formed such that the orifices 8 of the nozzle plate 3 according to the seventh embodiment (see Fig. 46A ) are rotated in the counterclockwise direction by 45° using the center 7a of the nozzle hole 7 as the center of rotation, and the nozzle holes 7 and the orifices 8 formed on the nozzle plate 3 according to the seventh embodiment in four places (see Fig. 46A ) are displaced radially outward with respect to the center axis 53 of the bottom wall portion 11.
  • spraying of fuel from the orifices 8 arranged adjacent to each other largely affects each other so that a larger amount of momentum in the swirling direction can be imparted to air swirled by the plurality of blades 100 by fine particles of fuel in the sprayed fuel thus forming a stronger spiral air flow.
  • Fig. 49 illustrates views showing a second modification of the nozzle plate 3 according to the seventh embodiment of the present invention.
  • Fig. 49A is a front view of the nozzle plate 3, and is also a view which corresponds to Fig. 46A .
  • Fig. 49B is a view taken along a line B44-B44 in Fig. 49A.
  • Fig. 49C is a back view of the nozzle plate, and is also a view which corresponds to Fig. 46D .
  • the nozzle plate 3 according to this modification differs from the nozzle plate 3 according to the seventh embodiment with respect to a point that a surface of an interference body plate portion 63 is formed coplanar with a surface of a bottom wall portion 11, while the interference body plate portion 63 is formed by counterboring a bottom wall portion 11 in a disc shape.
  • a bottomed circular hole 104 is formed on a back surface side of the bottom wall portion 11 by counterboring.
  • Four nozzle holes 7 are formed in a bottom surface of the circular hole 104.
  • a side surface 104a of the circular hole 104 is positioned so as to surround four nozzle holes 7.
  • the bottom wall portion 11 is obliquely formed by cutting or the like from a position slightly radially outside a radially inner end of the blade 100 toward a radially outer end of the blade 100 thus forming an inclined surface 105 having a hollow disc shape.
  • a radially outer end of the inclined surface 105 having a hollow disc shape is rounded by a gently-curved surface 106.
  • the nozzle plate 3 according to this modification is formed such that, as described above, a surface of the interference body plate portion 63 is coplanar with a surface of the bottom wall portion 11. Accordingly, compared to the nozzle plate 3 according to the seventh embodiment where the interference body plate portion 63 is formed by counterboring the bottom wall portion 11 in a disc shape, air which flows into an interference body plate portion side from the radially inner ends of the blade grooves 102 is minimally affected by a recessed portion and hence, a speed of air flowing toward an orifice 8 side from the radially inner ends of the blade grooves 102 becomes high.
  • a speed of air flowing toward an orifice 8 side from the radially inner ends of the blade grooves 102 is high and hence, when a momentum is imparted to air flowing toward an orifice 8 side by fine particles of fuel in the spray, a stronger spiral air flow is formed.
  • Fig. 50 illustrates views showing a third modification of the nozzle plate 3 according to the seventh embodiment of the present invention, and views showing a modification of the nozzle plate 3 according to the above-mentioned second modification.
  • Fig. 50A is a cross-sectional view of the nozzle plate 3 which corresponds to Fig. 49B
  • Fig. 50B is a back view of the nozzle plate 3 which corresponds to Fig. 49C .
  • the circular hole 104 formed on the back surface side of the bottom wall portion 11 of the nozzle plate 3 according to the above-mentioned second modification is replaced with a hole 107 having a ring shape so that an amount of fuel which stays in the hole 107 is set smaller than an amount of fuel which stays in the circular hole 104.
  • Fig. 51 illustrates views showing a fourth modification of the nozzle plate 3 according to the seventh embodiment of the present invention, and views showing a modification of the nozzle plate 3 according to the above-mentioned second modification.
  • Fig. 51 A is a cross-sectional view of the nozzle plate 3 which corresponds to Fig. 49B
  • Fig. 51 B is a back view of the nozzle plate 3 which corresponds to Fig. 49C .
  • the circular hole 104 formed on the back surface side of the bottom wall portion 11 of the nozzle plate 3 according to the above-mentioned second modification is replaced with a hole 108 having a cruciform so that an amount of fuel which stays in the hole 108 is set smaller than an amount of fuel which stays in the circular hole 104.
  • Fig. 52 illustrates views showing a nozzle plate 3 according to an eighth embodiment of the present invention.
  • Fig. 52 illustrates views showing the structure where the nozzle plate 3 according to the first modification of the seventh embodiment is further modified.
  • Fig. 53 illustrates views showing a center portion of the nozzle plate 3 shown in Fig. 52 in an enlarged manner.
  • a center nozzle hole 110 is formed at the center (position which is aligned with the center axis 53) of a bottom wall portion 11 in a penetrating manner along a center axis 53.
  • An outlet-side opening portion 111 of the center nozzle hole 110 on an outer surface side is partially closed by interference bodies 112 in four places.
  • Arcuate outer edge portions 113 of the interference bodies 112 in four places project inwardly in the radial direction of the center nozzle hole 110 so as to partially close the outlet-side opening portion 111 of the center nozzle hole 110 thus forming a center orifice 114.
  • Arcuate outer edge portions 113, 113 of the interference bodies 112, 112 arranged adjacent to each other are brought into contact with each other on an opening edge of the outlet-side opening portion 111 of the center nozzle hole 110.
  • Corner portions 115 are formed at intersecting portions of the pair of arcuate outer edge portions 113, 113.
  • the corner portions 115 are formed on the opening edge of the center orifice 114 in four places at equal intervals from each other, and have a non-rounded sharpened and pointed shape respectively.
  • the corner portion 115 can be formed into a sharpened and pointed shape by which an end portion of a liquid film of fuel which passes through the center orifice 114 can be easily atomized due to a friction between the end portion of the liquid film of fuel and air.
  • Each interference body 112 has: a fuel impinging surface 116 which is a flat surface orthogonal to the center axis 53 of the center nozzle hole 110; and a side surface (inclined surface) 70 which is formed obliquely by cutting or the like from the arcuate outer edge portion 113. Side surfaces 117 of the interference bodies 112, 112 arranged adjacent to each other are smoothly connected to each other by the corner portion 115 in an arcuate shape.
  • sprayed fuel generated by being injected from the center orifice 114 formed at the center of the bottom wall portion 11 is added to sprayed fuel generated by being injected from orifices 8 formed on the bottom wall portion 11 in four places. Accordingly, a peripheral spray fuel is sucked to a center sprayed fuel and, at the same time, a larger amount of momentum in the swirling direction is imparted to air swirled by a plurality of blades 100 by fine particles of fuel in the spray and hence, a stronger spiral air flow is formed.
  • the nozzle plate 3 according to this embodiment is also applicable to the nozzle plate 3 according to the seventh embodiment, and can acquire substantially the same advantageous effects as the nozzle plate 3 according to the seventh embodiment.
  • the shape of the center orifice 114 is not limited to the shape employed by this embodiment, and the shapes of the orifices employed by the above-mentioned other embodiments are also applicable.
  • the mode where the nozzle holes 7 are formed in four places, and the number of the blades 100 is set to the number twice as large as the number of the nozzle holes 7 (eight) is exemplified.
  • the configuration of the nozzle plates 3 is not limited to the above, and the nozzle holes 7 may be formed in a plurality of (two or more) places, and the number of the blades 100 may be set to the number twice as large as the number of the nozzle holes 7.
  • the number of the blade grooves 102 formed is set to a value twice as large as the number of the nozzle holes 7.
  • the number of the blade grooves 102 formed is not limited to the above, and may be set equal to the number of the nozzle holes 7.
  • the number of the blade grooves 102 is set to the number which is twice as large as the number of the nozzle holes 7.
  • the number of the blade grooves 102 is not limited to the above, and may be set to any multiples of the number of the nozzle holes 7.
  • the shape of the orifices 8 and the shape of the blades 100 are decided such that a swirling flow in the counterclockwise direction is generated around the center axis 53 of the bottom wall portion 11.
  • the present invention is not limited to the nozzle plates 3 according to these seventh and eighth embodiments, and the orifices 8 and the blades 100 (the shape of the blade 100 twisted in the leftward direction) may be formed into a shape such that a swirling flow in the clockwise direction is generated around the center axis 53 of the bottom wall portion 11.
  • a shape of the blade 100 as viewed in a plan view is an arcuate shape.
  • the shape of the blade 100 is not limited to an arcuate shape, and the shape of the blade 100 as viewed in a plan view may be a straight linear shape.
  • the nozzle plates 3 according to the above-mentioned third to eighth embodiments are not limited to the case where the nozzle plates 3 are manufactured using a synthetic resin material by injection molding, and the nozzle plates 3 may be manufactured by a metal injection molding method.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
EP14798280.5A 2013-05-13 2014-05-02 Kraftstoffeinspritzdüsenplatte Not-in-force EP2998567B1 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2013101268 2013-05-13
JP2013152629 2013-07-23
JP2013216186 2013-10-17
JP2013256822 2013-12-12
JP2014024846A JP6429461B2 (ja) 2013-05-13 2014-02-12 燃料噴射装置用ノズルプレート
PCT/JP2014/062148 WO2014185290A1 (ja) 2013-05-13 2014-05-02 燃料噴射装置用ノズルプレート

Publications (3)

Publication Number Publication Date
EP2998567A1 true EP2998567A1 (de) 2016-03-23
EP2998567A4 EP2998567A4 (de) 2016-10-26
EP2998567B1 EP2998567B1 (de) 2018-08-22

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US (1) US10352285B2 (de)
EP (1) EP2998567B1 (de)
JP (1) JP6429461B2 (de)
CN (1) CN105190020B (de)
WO (1) WO2014185290A1 (de)

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JP6433162B2 (ja) * 2014-02-12 2018-12-05 株式会社エンプラス 燃料噴射装置用ノズルプレート
JP6460802B2 (ja) * 2015-01-09 2019-01-30 株式会社エンプラス 燃料噴射装置用ノズルプレート
JP6641748B2 (ja) * 2015-07-08 2020-02-05 株式会社三洋物産 遊技機
WO2019206895A1 (en) 2018-04-25 2019-10-31 Robert Bosch Gmbh Fuel injector valve seat assembly including insert locating and retention features
US10808668B2 (en) * 2018-10-02 2020-10-20 Ford Global Technologies, Llc Methods and systems for a fuel injector

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DE8709111U1 (de) * 1987-07-01 1987-09-17 Siemens AG, 1000 Berlin und 8000 München Einspritzventil
DE4104019C1 (de) * 1991-02-09 1992-04-23 Robert Bosch Gmbh, 7000 Stuttgart, De
DE19637103A1 (de) * 1996-09-12 1998-03-19 Bosch Gmbh Robert Ventil, insbesondere Brennstoffeinspritzventil
JPH10122097A (ja) 1996-10-16 1998-05-12 Aisan Ind Co Ltd 燃料噴射弁
DE19703200A1 (de) * 1997-01-30 1998-08-06 Bosch Gmbh Robert Brennstoffeinspritzventil
JP2002115627A (ja) * 2000-10-05 2002-04-19 Optonix Seimitsu:Kk オリフィスプレートおよびオリフィスプレートの製造方法
JP3745232B2 (ja) 2001-01-17 2006-02-15 愛三工業株式会社 流体噴射ノズルとその流体噴射ノズルを備えた流体噴射弁
US6848635B2 (en) * 2002-01-31 2005-02-01 Visteon Global Technologies, Inc. Fuel injector nozzle assembly with induced turbulence
JP4154317B2 (ja) * 2003-04-25 2008-09-24 トヨタ自動車株式会社 燃料噴射弁
JP4147405B2 (ja) * 2003-09-25 2008-09-10 株式会社デンソー 燃料噴射弁
JP2006112391A (ja) * 2004-10-18 2006-04-27 Nissan Motor Co Ltd 燃料噴射装置
JP4988791B2 (ja) * 2009-06-18 2012-08-01 日立オートモティブシステムズ株式会社 燃料噴射弁

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US10352285B2 (en) 2019-07-16
CN105190020A (zh) 2015-12-23
WO2014185290A1 (ja) 2014-11-20
EP2998567B1 (de) 2018-08-22
JP6429461B2 (ja) 2018-11-28
JP2015132253A (ja) 2015-07-23
CN105190020B (zh) 2018-11-20
EP2998567A4 (de) 2016-10-26
US20160097361A1 (en) 2016-04-07

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